diff --git a/homeassistant/components/anthropic/__init__.py b/homeassistant/components/anthropic/__init__.py
index a9745d1a6a5..c13c82f0020 100644
--- a/homeassistant/components/anthropic/__init__.py
+++ b/homeassistant/components/anthropic/__init__.py
@@ -6,11 +6,16 @@ from functools import partial
 
 import anthropic
 
-from homeassistant.config_entries import ConfigEntry
+from homeassistant.config_entries import ConfigEntry, ConfigSubentry
 from homeassistant.const import CONF_API_KEY, Platform
 from homeassistant.core import HomeAssistant
 from homeassistant.exceptions import ConfigEntryNotReady
-from homeassistant.helpers import config_validation as cv
+from homeassistant.helpers import (
+    config_validation as cv,
+    device_registry as dr,
+    entity_registry as er,
+)
+from homeassistant.helpers.typing import ConfigType
 
 from .const import CONF_CHAT_MODEL, DOMAIN, LOGGER, RECOMMENDED_CHAT_MODEL
 
@@ -20,13 +25,24 @@ CONFIG_SCHEMA = cv.config_entry_only_config_schema(DOMAIN)
 type AnthropicConfigEntry = ConfigEntry[anthropic.AsyncClient]
 
 
+async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
+    """Set up Anthropic."""
+    await async_migrate_integration(hass)
+    return True
+
+
 async def async_setup_entry(hass: HomeAssistant, entry: AnthropicConfigEntry) -> bool:
     """Set up Anthropic from a config entry."""
     client = await hass.async_add_executor_job(
         partial(anthropic.AsyncAnthropic, api_key=entry.data[CONF_API_KEY])
     )
     try:
-        model_id = entry.options.get(CONF_CHAT_MODEL, RECOMMENDED_CHAT_MODEL)
+        # Use model from first conversation subentry for validation
+        subentries = list(entry.subentries.values())
+        if subentries:
+            model_id = subentries[0].data.get(CONF_CHAT_MODEL, RECOMMENDED_CHAT_MODEL)
+        else:
+            model_id = RECOMMENDED_CHAT_MODEL
         model = await client.models.retrieve(model_id=model_id, timeout=10.0)
         LOGGER.debug("Anthropic model: %s", model.display_name)
     except anthropic.AuthenticationError as err:
@@ -45,3 +61,68 @@ async def async_setup_entry(hass: HomeAssistant, entry: AnthropicConfigEntry) ->
 async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     """Unload Anthropic."""
     return await hass.config_entries.async_unload_platforms(entry, PLATFORMS)
+
+
+async def async_migrate_integration(hass: HomeAssistant) -> None:
+    """Migrate integration entry structure."""
+
+    entries = hass.config_entries.async_entries(DOMAIN)
+    if not any(entry.version == 1 for entry in entries):
+        return
+
+    api_keys_entries: dict[str, ConfigEntry] = {}
+    entity_registry = er.async_get(hass)
+    device_registry = dr.async_get(hass)
+
+    for entry in entries:
+        use_existing = False
+        subentry = ConfigSubentry(
+            data=entry.options,
+            subentry_type="conversation",
+            title=entry.title,
+            unique_id=None,
+        )
+        if entry.data[CONF_API_KEY] not in api_keys_entries:
+            use_existing = True
+            api_keys_entries[entry.data[CONF_API_KEY]] = entry
+
+        parent_entry = api_keys_entries[entry.data[CONF_API_KEY]]
+
+        hass.config_entries.async_add_subentry(parent_entry, subentry)
+        conversation_entity = entity_registry.async_get_entity_id(
+            "conversation",
+            DOMAIN,
+            entry.entry_id,
+        )
+        if conversation_entity is not None:
+            entity_registry.async_update_entity(
+                conversation_entity,
+                config_entry_id=parent_entry.entry_id,
+                config_subentry_id=subentry.subentry_id,
+                new_unique_id=subentry.subentry_id,
+            )
+
+        device = device_registry.async_get_device(
+            identifiers={(DOMAIN, entry.entry_id)}
+        )
+        if device is not None:
+            device_registry.async_update_device(
+                device.id,
+                new_identifiers={(DOMAIN, subentry.subentry_id)},
+                add_config_subentry_id=subentry.subentry_id,
+                add_config_entry_id=parent_entry.entry_id,
+            )
+            if parent_entry.entry_id != entry.entry_id:
+                device_registry.async_update_device(
+                    device.id,
+                    remove_config_entry_id=entry.entry_id,
+                )
+
+        if not use_existing:
+            await hass.config_entries.async_remove(entry.entry_id)
+        else:
+            hass.config_entries.async_update_entry(
+                entry,
+                options={},
+                version=2,
+            )
diff --git a/homeassistant/components/anthropic/config_flow.py b/homeassistant/components/anthropic/config_flow.py
index ebad206af61..6a18cb693cd 100644
--- a/homeassistant/components/anthropic/config_flow.py
+++ b/homeassistant/components/anthropic/config_flow.py
@@ -5,20 +5,21 @@ from __future__ import annotations
 from collections.abc import Mapping
 from functools import partial
 import logging
-from types import MappingProxyType
-from typing import Any
+from typing import Any, cast
 
 import anthropic
 import voluptuous as vol
 
 from homeassistant.config_entries import (
     ConfigEntry,
+    ConfigEntryState,
     ConfigFlow,
     ConfigFlowResult,
-    OptionsFlow,
+    ConfigSubentryFlow,
+    SubentryFlowResult,
 )
-from homeassistant.const import CONF_API_KEY, CONF_LLM_HASS_API
-from homeassistant.core import HomeAssistant
+from homeassistant.const import CONF_API_KEY, CONF_LLM_HASS_API, CONF_NAME
+from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers import llm
 from homeassistant.helpers.selector import (
     NumberSelector,
@@ -36,6 +37,7 @@ from .const import (
     CONF_RECOMMENDED,
     CONF_TEMPERATURE,
     CONF_THINKING_BUDGET,
+    DEFAULT_CONVERSATION_NAME,
     DOMAIN,
     RECOMMENDED_CHAT_MODEL,
     RECOMMENDED_MAX_TOKENS,
@@ -72,7 +74,7 @@ async def validate_input(hass: HomeAssistant, data: dict[str, Any]) -> None:
 class AnthropicConfigFlow(ConfigFlow, domain=DOMAIN):
     """Handle a config flow for Anthropic."""
 
-    VERSION = 1
+    VERSION = 2
 
     async def async_step_user(
         self, user_input: dict[str, Any] | None = None
@@ -81,6 +83,7 @@ class AnthropicConfigFlow(ConfigFlow, domain=DOMAIN):
         errors = {}
 
         if user_input is not None:
+            self._async_abort_entries_match(user_input)
             try:
                 await validate_input(self.hass, user_input)
             except anthropic.APITimeoutError:
@@ -102,57 +105,93 @@ class AnthropicConfigFlow(ConfigFlow, domain=DOMAIN):
                 return self.async_create_entry(
                     title="Claude",
                     data=user_input,
-                    options=RECOMMENDED_OPTIONS,
+                    subentries=[
+                        {
+                            "subentry_type": "conversation",
+                            "data": RECOMMENDED_OPTIONS,
+                            "title": DEFAULT_CONVERSATION_NAME,
+                            "unique_id": None,
+                        }
+                    ],
                 )
 
         return self.async_show_form(
             step_id="user", data_schema=STEP_USER_DATA_SCHEMA, errors=errors or None
         )
 
-    @staticmethod
-    def async_get_options_flow(
-        config_entry: ConfigEntry,
-    ) -> OptionsFlow:
-        """Create the options flow."""
-        return AnthropicOptionsFlow(config_entry)
+    @classmethod
+    @callback
+    def async_get_supported_subentry_types(
+        cls, config_entry: ConfigEntry
+    ) -> dict[str, type[ConfigSubentryFlow]]:
+        """Return subentries supported by this integration."""
+        return {"conversation": ConversationSubentryFlowHandler}
 
 
-class AnthropicOptionsFlow(OptionsFlow):
-    """Anthropic config flow options handler."""
+class ConversationSubentryFlowHandler(ConfigSubentryFlow):
+    """Flow for managing conversation subentries."""
 
-    def __init__(self, config_entry: ConfigEntry) -> None:
-        """Initialize options flow."""
-        self.last_rendered_recommended = config_entry.options.get(
-            CONF_RECOMMENDED, False
-        )
+    last_rendered_recommended = False
 
-    async def async_step_init(
+    @property
+    def _is_new(self) -> bool:
+        """Return if this is a new subentry."""
+        return self.source == "user"
+
+    async def async_step_set_options(
         self, user_input: dict[str, Any] | None = None
-    ) -> ConfigFlowResult:
-        """Manage the options."""
-        options: dict[str, Any] | MappingProxyType[str, Any] = self.config_entry.options
+    ) -> SubentryFlowResult:
+        """Set conversation options."""
+        # abort if entry is not loaded
+        if self._get_entry().state != ConfigEntryState.LOADED:
+            return self.async_abort(reason="entry_not_loaded")
+
         errors: dict[str, str] = {}
 
-        if user_input is not None:
-            if user_input[CONF_RECOMMENDED] == self.last_rendered_recommended:
-                if not user_input.get(CONF_LLM_HASS_API):
-                    user_input.pop(CONF_LLM_HASS_API, None)
-                if user_input.get(
-                    CONF_THINKING_BUDGET, RECOMMENDED_THINKING_BUDGET
-                ) >= user_input.get(CONF_MAX_TOKENS, RECOMMENDED_MAX_TOKENS):
-                    errors[CONF_THINKING_BUDGET] = "thinking_budget_too_large"
-
-                if not errors:
-                    return self.async_create_entry(title="", data=user_input)
+        if user_input is None:
+            if self._is_new:
+                options = RECOMMENDED_OPTIONS.copy()
             else:
-                # Re-render the options again, now with the recommended options shown/hidden
-                self.last_rendered_recommended = user_input[CONF_RECOMMENDED]
+                # If this is a reconfiguration, we need to copy the existing options
+                # so that we can show the current values in the form.
+                options = self._get_reconfigure_subentry().data.copy()
 
-                options = {
-                    CONF_RECOMMENDED: user_input[CONF_RECOMMENDED],
-                    CONF_PROMPT: user_input[CONF_PROMPT],
-                    CONF_LLM_HASS_API: user_input.get(CONF_LLM_HASS_API),
-                }
+            self.last_rendered_recommended = cast(
+                bool, options.get(CONF_RECOMMENDED, False)
+            )
+
+        elif user_input[CONF_RECOMMENDED] == self.last_rendered_recommended:
+            if not user_input.get(CONF_LLM_HASS_API):
+                user_input.pop(CONF_LLM_HASS_API, None)
+            if user_input.get(
+                CONF_THINKING_BUDGET, RECOMMENDED_THINKING_BUDGET
+            ) >= user_input.get(CONF_MAX_TOKENS, RECOMMENDED_MAX_TOKENS):
+                errors[CONF_THINKING_BUDGET] = "thinking_budget_too_large"
+
+            if not errors:
+                if self._is_new:
+                    return self.async_create_entry(
+                        title=user_input.pop(CONF_NAME),
+                        data=user_input,
+                    )
+
+                return self.async_update_and_abort(
+                    self._get_entry(),
+                    self._get_reconfigure_subentry(),
+                    data=user_input,
+                )
+
+            options = user_input
+            self.last_rendered_recommended = user_input[CONF_RECOMMENDED]
+        else:
+            # Re-render the options again, now with the recommended options shown/hidden
+            self.last_rendered_recommended = user_input[CONF_RECOMMENDED]
+
+            options = {
+                CONF_RECOMMENDED: user_input[CONF_RECOMMENDED],
+                CONF_PROMPT: user_input[CONF_PROMPT],
+                CONF_LLM_HASS_API: user_input.get(CONF_LLM_HASS_API),
+            }
 
         suggested_values = options.copy()
         if not suggested_values.get(CONF_PROMPT):
@@ -163,19 +202,25 @@ class AnthropicOptionsFlow(OptionsFlow):
             suggested_values[CONF_LLM_HASS_API] = [suggested_llm_apis]
 
         schema = self.add_suggested_values_to_schema(
-            vol.Schema(anthropic_config_option_schema(self.hass, options)),
+            vol.Schema(
+                anthropic_config_option_schema(self.hass, self._is_new, options)
+            ),
             suggested_values,
         )
 
         return self.async_show_form(
-            step_id="init",
+            step_id="set_options",
             data_schema=schema,
             errors=errors or None,
         )
 
+    async_step_user = async_step_set_options
+    async_step_reconfigure = async_step_set_options
+
 
 def anthropic_config_option_schema(
     hass: HomeAssistant,
+    is_new: bool,
     options: Mapping[str, Any],
 ) -> dict:
     """Return a schema for Anthropic completion options."""
@@ -187,15 +232,24 @@ def anthropic_config_option_schema(
         for api in llm.async_get_apis(hass)
     ]
 
-    schema = {
-        vol.Optional(CONF_PROMPT): TemplateSelector(),
-        vol.Optional(
-            CONF_LLM_HASS_API,
-        ): SelectSelector(SelectSelectorConfig(options=hass_apis, multiple=True)),
-        vol.Required(
-            CONF_RECOMMENDED, default=options.get(CONF_RECOMMENDED, False)
-        ): bool,
-    }
+    if is_new:
+        schema: dict[vol.Required | vol.Optional, Any] = {
+            vol.Required(CONF_NAME, default=DEFAULT_CONVERSATION_NAME): str,
+        }
+    else:
+        schema = {}
+
+    schema.update(
+        {
+            vol.Optional(CONF_PROMPT): TemplateSelector(),
+            vol.Optional(
+                CONF_LLM_HASS_API,
+            ): SelectSelector(SelectSelectorConfig(options=hass_apis, multiple=True)),
+            vol.Required(
+                CONF_RECOMMENDED, default=options.get(CONF_RECOMMENDED, False)
+            ): bool,
+        }
+    )
 
     if options.get(CONF_RECOMMENDED):
         return schema
diff --git a/homeassistant/components/anthropic/const.py b/homeassistant/components/anthropic/const.py
index 69789b9a64a..d7e10dd7af2 100644
--- a/homeassistant/components/anthropic/const.py
+++ b/homeassistant/components/anthropic/const.py
@@ -5,6 +5,8 @@ import logging
 DOMAIN = "anthropic"
 LOGGER = logging.getLogger(__package__)
 
+DEFAULT_CONVERSATION_NAME = "Claude conversation"
+
 CONF_RECOMMENDED = "recommended"
 CONF_PROMPT = "prompt"
 CONF_CHAT_MODEL = "chat_model"
diff --git a/homeassistant/components/anthropic/conversation.py b/homeassistant/components/anthropic/conversation.py
index f17294fe0e7..f34d9ed97b6 100644
--- a/homeassistant/components/anthropic/conversation.py
+++ b/homeassistant/components/anthropic/conversation.py
@@ -38,7 +38,7 @@ from anthropic.types import (
 from voluptuous_openapi import convert
 
 from homeassistant.components import conversation
-from homeassistant.config_entries import ConfigEntry
+from homeassistant.config_entries import ConfigEntry, ConfigSubentry
 from homeassistant.const import CONF_LLM_HASS_API, MATCH_ALL
 from homeassistant.core import HomeAssistant
 from homeassistant.exceptions import HomeAssistantError
@@ -72,8 +72,14 @@ async def async_setup_entry(
     async_add_entities: AddConfigEntryEntitiesCallback,
 ) -> None:
     """Set up conversation entities."""
-    agent = AnthropicConversationEntity(config_entry)
-    async_add_entities([agent])
+    for subentry in config_entry.subentries.values():
+        if subentry.subentry_type != "conversation":
+            continue
+
+        async_add_entities(
+            [AnthropicConversationEntity(config_entry, subentry)],
+            config_subentry_id=subentry.subentry_id,
+        )
 
 
 def _format_tool(
@@ -326,21 +332,22 @@ class AnthropicConversationEntity(
 ):
     """Anthropic conversation agent."""
 
-    _attr_has_entity_name = True
-    _attr_name = None
     _attr_supports_streaming = True
 
-    def __init__(self, entry: AnthropicConfigEntry) -> None:
+    def __init__(self, entry: AnthropicConfigEntry, subentry: ConfigSubentry) -> None:
         """Initialize the agent."""
         self.entry = entry
-        self._attr_unique_id = entry.entry_id
+        self.subentry = subentry
+        self._attr_name = subentry.title
+        self._attr_unique_id = subentry.subentry_id
         self._attr_device_info = dr.DeviceInfo(
-            identifiers={(DOMAIN, entry.entry_id)},
+            identifiers={(DOMAIN, subentry.subentry_id)},
+            name=subentry.title,
             manufacturer="Anthropic",
             model="Claude",
             entry_type=dr.DeviceEntryType.SERVICE,
         )
-        if self.entry.options.get(CONF_LLM_HASS_API):
+        if self.subentry.data.get(CONF_LLM_HASS_API):
             self._attr_supported_features = (
                 conversation.ConversationEntityFeature.CONTROL
             )
@@ -363,7 +370,7 @@ class AnthropicConversationEntity(
         chat_log: conversation.ChatLog,
     ) -> conversation.ConversationResult:
         """Call the API."""
-        options = self.entry.options
+        options = self.subentry.data
 
         try:
             await chat_log.async_provide_llm_data(
@@ -393,7 +400,7 @@ class AnthropicConversationEntity(
         chat_log: conversation.ChatLog,
     ) -> None:
         """Generate an answer for the chat log."""
-        options = self.entry.options
+        options = self.subentry.data
 
         tools: list[ToolParam] | None = None
         if chat_log.llm_api:
diff --git a/homeassistant/components/anthropic/strings.json b/homeassistant/components/anthropic/strings.json
index c2caf3a6666..098b4d5fa74 100644
--- a/homeassistant/components/anthropic/strings.json
+++ b/homeassistant/components/anthropic/strings.json
@@ -12,28 +12,44 @@
       "timeout_connect": "[%key:common::config_flow::error::timeout_connect%]",
       "authentication_error": "[%key:common::config_flow::error::invalid_auth%]",
       "unknown": "[%key:common::config_flow::error::unknown%]"
+    },
+    "abort": {
+      "already_configured": "[%key:common::config_flow::abort::already_configured_service%]"
     }
   },
-  "options": {
-    "step": {
-      "init": {
-        "data": {
-          "prompt": "Instructions",
-          "chat_model": "[%key:common::generic::model%]",
-          "max_tokens": "Maximum tokens to return in response",
-          "temperature": "Temperature",
-          "llm_hass_api": "[%key:common::config_flow::data::llm_hass_api%]",
-          "recommended": "Recommended model settings",
-          "thinking_budget_tokens": "Thinking budget"
-        },
-        "data_description": {
-          "prompt": "Instruct how the LLM should respond. This can be a template.",
-          "thinking_budget_tokens": "The number of tokens the model can use to think about the response out of the total maximum number of tokens. Set to 1024 or greater to enable extended thinking."
+  "config_subentries": {
+    "conversation": {
+      "initiate_flow": {
+        "user": "Add conversation agent",
+        "reconfigure": "Reconfigure conversation agent"
+      },
+      "entry_type": "Conversation agent",
+
+      "step": {
+        "set_options": {
+          "data": {
+            "name": "[%key:common::config_flow::data::name%]",
+            "prompt": "Instructions",
+            "chat_model": "[%key:common::generic::model%]",
+            "max_tokens": "Maximum tokens to return in response",
+            "temperature": "Temperature",
+            "llm_hass_api": "[%key:common::config_flow::data::llm_hass_api%]",
+            "recommended": "Recommended model settings",
+            "thinking_budget_tokens": "Thinking budget"
+          },
+          "data_description": {
+            "prompt": "Instruct how the LLM should respond. This can be a template.",
+            "thinking_budget_tokens": "The number of tokens the model can use to think about the response out of the total maximum number of tokens. Set to 1024 or greater to enable extended thinking."
+          }
         }
+      },
+      "abort": {
+        "reconfigure_successful": "[%key:common::config_flow::abort::reconfigure_successful%]",
+        "entry_not_loaded": "Cannot add things while the configuration is disabled."
+      },
+      "error": {
+        "thinking_budget_too_large": "Maximum tokens must be greater than the thinking budget."
       }
-    },
-    "error": {
-      "thinking_budget_too_large": "Maximum tokens must be greater than the thinking budget."
     }
   }
 }
diff --git a/tests/components/anthropic/conftest.py b/tests/components/anthropic/conftest.py
index 7419ea6c28f..53e00447a2e 100644
--- a/tests/components/anthropic/conftest.py
+++ b/tests/components/anthropic/conftest.py
@@ -6,6 +6,7 @@ from unittest.mock import patch
 import pytest
 
 from homeassistant.components.anthropic import CONF_CHAT_MODEL
+from homeassistant.components.anthropic.const import DEFAULT_CONVERSATION_NAME
 from homeassistant.const import CONF_LLM_HASS_API
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers import llm
@@ -23,6 +24,15 @@ def mock_config_entry(hass: HomeAssistant) -> MockConfigEntry:
         data={
             "api_key": "bla",
         },
+        version=2,
+        subentries_data=[
+            {
+                "data": {},
+                "subentry_type": "conversation",
+                "title": DEFAULT_CONVERSATION_NAME,
+                "unique_id": None,
+            }
+        ],
     )
     entry.add_to_hass(hass)
     return entry
@@ -33,8 +43,10 @@ def mock_config_entry_with_assist(
     hass: HomeAssistant, mock_config_entry: MockConfigEntry
 ) -> MockConfigEntry:
     """Mock a config entry with assist."""
-    hass.config_entries.async_update_entry(
-        mock_config_entry, options={CONF_LLM_HASS_API: llm.LLM_API_ASSIST}
+    hass.config_entries.async_update_subentry(
+        mock_config_entry,
+        next(iter(mock_config_entry.subentries.values())),
+        data={CONF_LLM_HASS_API: llm.LLM_API_ASSIST},
     )
     return mock_config_entry
 
@@ -44,9 +56,10 @@ def mock_config_entry_with_extended_thinking(
     hass: HomeAssistant, mock_config_entry: MockConfigEntry
 ) -> MockConfigEntry:
     """Mock a config entry with assist."""
-    hass.config_entries.async_update_entry(
+    hass.config_entries.async_update_subentry(
         mock_config_entry,
-        options={
+        next(iter(mock_config_entry.subentries.values())),
+        data={
             CONF_LLM_HASS_API: llm.LLM_API_ASSIST,
             CONF_CHAT_MODEL: "claude-3-7-sonnet-latest",
         },
diff --git a/tests/components/anthropic/snapshots/test_conversation.ambr b/tests/components/anthropic/snapshots/test_conversation.ambr
index ea4ce5a980d..09618b135db 100644
--- a/tests/components/anthropic/snapshots/test_conversation.ambr
+++ b/tests/components/anthropic/snapshots/test_conversation.ambr
@@ -16,7 +16,7 @@
       'role': 'user',
     }),
     dict({
-      'agent_id': 'conversation.claude',
+      'agent_id': 'conversation.claude_conversation',
       'content': 'Certainly, calling it now!',
       'role': 'assistant',
       'tool_calls': list([
@@ -30,14 +30,14 @@
       ]),
     }),
     dict({
-      'agent_id': 'conversation.claude',
+      'agent_id': 'conversation.claude_conversation',
       'role': 'tool_result',
       'tool_call_id': 'toolu_0123456789AbCdEfGhIjKlM',
       'tool_name': 'test_tool',
       'tool_result': 'Test response',
     }),
     dict({
-      'agent_id': 'conversation.claude',
+      'agent_id': 'conversation.claude_conversation',
       'content': 'I have successfully called the function',
       'role': 'assistant',
       'tool_calls': None,
diff --git a/tests/components/anthropic/test_config_flow.py b/tests/components/anthropic/test_config_flow.py
index 1f41b7df2c7..2eac125f5c3 100644
--- a/tests/components/anthropic/test_config_flow.py
+++ b/tests/components/anthropic/test_config_flow.py
@@ -1,6 +1,6 @@
 """Test the Anthropic config flow."""
 
-from unittest.mock import AsyncMock, patch
+from unittest.mock import AsyncMock, Mock, patch
 
 from anthropic import (
     APIConnectionError,
@@ -22,12 +22,13 @@ from homeassistant.components.anthropic.const import (
     CONF_RECOMMENDED,
     CONF_TEMPERATURE,
     CONF_THINKING_BUDGET,
+    DEFAULT_CONVERSATION_NAME,
     DOMAIN,
     RECOMMENDED_CHAT_MODEL,
     RECOMMENDED_MAX_TOKENS,
     RECOMMENDED_THINKING_BUDGET,
 )
-from homeassistant.const import CONF_LLM_HASS_API
+from homeassistant.const import CONF_API_KEY, CONF_LLM_HASS_API, CONF_NAME
 from homeassistant.core import HomeAssistant
 from homeassistant.data_entry_flow import FlowResultType
 
@@ -71,39 +72,103 @@ async def test_form(hass: HomeAssistant) -> None:
     assert result2["data"] == {
         "api_key": "bla",
     }
-    assert result2["options"] == RECOMMENDED_OPTIONS
+    assert result2["options"] == {}
+    assert result2["subentries"] == [
+        {
+            "subentry_type": "conversation",
+            "data": RECOMMENDED_OPTIONS,
+            "title": DEFAULT_CONVERSATION_NAME,
+            "unique_id": None,
+        }
+    ]
     assert len(mock_setup_entry.mock_calls) == 1
 
 
-async def test_options(
+async def test_duplicate_entry(hass: HomeAssistant) -> None:
+    """Test we abort on duplicate config entry."""
+    MockConfigEntry(
+        domain=DOMAIN,
+        data={CONF_API_KEY: "bla"},
+    ).add_to_hass(hass)
+
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": config_entries.SOURCE_USER}
+    )
+    assert result["type"] is FlowResultType.FORM
+    assert not result["errors"]
+
+    with patch(
+        "anthropic.resources.models.AsyncModels.retrieve",
+        return_value=Mock(display_name="Claude 3.5 Sonnet"),
+    ):
+        result = await hass.config_entries.flow.async_configure(
+            result["flow_id"],
+            {
+                CONF_API_KEY: "bla",
+            },
+        )
+
+    assert result["type"] is FlowResultType.ABORT
+    assert result["reason"] == "already_configured"
+
+
+async def test_creating_conversation_subentry(
     hass: HomeAssistant, mock_config_entry, mock_init_component
 ) -> None:
-    """Test the options form."""
-    options_flow = await hass.config_entries.options.async_init(
-        mock_config_entry.entry_id
+    """Test creating a conversation subentry."""
+    result = await hass.config_entries.subentries.async_init(
+        (mock_config_entry.entry_id, "conversation"),
+        context={"source": config_entries.SOURCE_USER},
     )
-    options = await hass.config_entries.options.async_configure(
-        options_flow["flow_id"],
-        {
-            "prompt": "Speak like a pirate",
-            "max_tokens": 200,
-        },
+
+    assert result["type"] is FlowResultType.FORM
+    assert result["step_id"] == "set_options"
+    assert not result["errors"]
+
+    result2 = await hass.config_entries.subentries.async_configure(
+        result["flow_id"],
+        {CONF_NAME: "Mock name", **RECOMMENDED_OPTIONS},
     )
     await hass.async_block_till_done()
-    assert options["type"] is FlowResultType.CREATE_ENTRY
-    assert options["data"]["prompt"] == "Speak like a pirate"
-    assert options["data"]["max_tokens"] == 200
-    assert options["data"][CONF_CHAT_MODEL] == RECOMMENDED_CHAT_MODEL
+
+    assert result2["type"] is FlowResultType.CREATE_ENTRY
+    assert result2["title"] == "Mock name"
+
+    processed_options = RECOMMENDED_OPTIONS.copy()
+    processed_options[CONF_PROMPT] = processed_options[CONF_PROMPT].strip()
+
+    assert result2["data"] == processed_options
 
 
-async def test_options_thinking_budget_more_than_max(
+async def test_creating_conversation_subentry_not_loaded(
+    hass: HomeAssistant,
+    mock_init_component,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test creating a conversation subentry when entry is not loaded."""
+    await hass.config_entries.async_unload(mock_config_entry.entry_id)
+    with patch(
+        "anthropic.resources.models.AsyncModels.list",
+        return_value=[],
+    ):
+        result = await hass.config_entries.subentries.async_init(
+            (mock_config_entry.entry_id, "conversation"),
+            context={"source": config_entries.SOURCE_USER},
+        )
+
+    assert result["type"] is FlowResultType.ABORT
+    assert result["reason"] == "entry_not_loaded"
+
+
+async def test_subentry_options_thinking_budget_more_than_max(
     hass: HomeAssistant, mock_config_entry, mock_init_component
 ) -> None:
     """Test error about thinking budget being more than max tokens."""
-    options_flow = await hass.config_entries.options.async_init(
-        mock_config_entry.entry_id
+    subentry = next(iter(mock_config_entry.subentries.values()))
+    options_flow = await mock_config_entry.start_subentry_reconfigure_flow(
+        hass, subentry.subentry_id
     )
-    options = await hass.config_entries.options.async_configure(
+    options = await hass.config_entries.subentries.async_configure(
         options_flow["flow_id"],
         {
             "prompt": "Speak like a pirate",
@@ -111,6 +176,7 @@ async def test_options_thinking_budget_more_than_max(
             "chat_model": "claude-3-7-sonnet-latest",
             "temperature": 1,
             "thinking_budget": 16384,
+            "recommended": False,
         },
     )
     await hass.async_block_till_done()
@@ -252,7 +318,7 @@ async def test_form_invalid_auth(hass: HomeAssistant, side_effect, error) -> Non
         ),
     ],
 )
-async def test_options_switching(
+async def test_subentry_options_switching(
     hass: HomeAssistant,
     mock_config_entry,
     mock_init_component,
@@ -260,23 +326,29 @@ async def test_options_switching(
     new_options,
     expected_options,
 ) -> None:
-    """Test the options form."""
-    hass.config_entries.async_update_entry(mock_config_entry, options=current_options)
-    options_flow = await hass.config_entries.options.async_init(
-        mock_config_entry.entry_id
+    """Test the subentry options form."""
+    subentry = next(iter(mock_config_entry.subentries.values()))
+    hass.config_entries.async_update_subentry(
+        mock_config_entry, subentry, data=current_options
+    )
+    await hass.async_block_till_done()
+
+    options_flow = await mock_config_entry.start_subentry_reconfigure_flow(
+        hass, subentry.subentry_id
     )
     if current_options.get(CONF_RECOMMENDED) != new_options.get(CONF_RECOMMENDED):
-        options_flow = await hass.config_entries.options.async_configure(
+        options_flow = await hass.config_entries.subentries.async_configure(
             options_flow["flow_id"],
             {
                 **current_options,
                 CONF_RECOMMENDED: new_options[CONF_RECOMMENDED],
             },
         )
-    options = await hass.config_entries.options.async_configure(
+    options = await hass.config_entries.subentries.async_configure(
         options_flow["flow_id"],
         new_options,
     )
     await hass.async_block_till_done()
-    assert options["type"] is FlowResultType.CREATE_ENTRY
-    assert options["data"] == expected_options
+    assert options["type"] is FlowResultType.ABORT
+    assert options["reason"] == "reconfigure_successful"
+    assert subentry.data == expected_options
diff --git a/tests/components/anthropic/test_conversation.py b/tests/components/anthropic/test_conversation.py
index 6aadcf3eeb4..3ae44e552cc 100644
--- a/tests/components/anthropic/test_conversation.py
+++ b/tests/components/anthropic/test_conversation.py
@@ -180,21 +180,23 @@ async def test_entity(
     mock_init_component,
 ) -> None:
     """Test entity properties."""
-    state = hass.states.get("conversation.claude")
+    state = hass.states.get("conversation.claude_conversation")
     assert state
     assert state.attributes["supported_features"] == 0
 
-    hass.config_entries.async_update_entry(
+    subentry = next(iter(mock_config_entry.subentries.values()))
+    hass.config_entries.async_update_subentry(
         mock_config_entry,
-        options={
-            **mock_config_entry.options,
+        subentry,
+        data={
+            **subentry.data,
             CONF_LLM_HASS_API: "assist",
         },
     )
     with patch("anthropic.resources.models.AsyncModels.retrieve"):
         await hass.config_entries.async_reload(mock_config_entry.entry_id)
 
-    state = hass.states.get("conversation.claude")
+    state = hass.states.get("conversation.claude_conversation")
     assert state
     assert (
         state.attributes["supported_features"]
@@ -218,7 +220,7 @@ async def test_error_handling(
         ),
     ):
         result = await conversation.async_converse(
-            hass, "hello", None, Context(), agent_id="conversation.claude"
+            hass, "hello", None, Context(), agent_id="conversation.claude_conversation"
         )
 
     assert result.response.response_type == intent.IntentResponseType.ERROR
@@ -229,9 +231,11 @@ async def test_template_error(
     hass: HomeAssistant, mock_config_entry: MockConfigEntry
 ) -> None:
     """Test that template error handling works."""
-    hass.config_entries.async_update_entry(
+    subentry = next(iter(mock_config_entry.subentries.values()))
+    hass.config_entries.async_update_subentry(
         mock_config_entry,
-        options={
+        subentry,
+        data={
             "prompt": "talk like a {% if True %}smarthome{% else %}pirate please.",
         },
     )
@@ -244,7 +248,7 @@ async def test_template_error(
         await hass.config_entries.async_setup(mock_config_entry.entry_id)
         await hass.async_block_till_done()
         result = await conversation.async_converse(
-            hass, "hello", None, Context(), agent_id="conversation.claude"
+            hass, "hello", None, Context(), agent_id="conversation.claude_conversation"
         )
 
     assert result.response.response_type == intent.IntentResponseType.ERROR
@@ -260,9 +264,11 @@ async def test_template_variables(
     mock_user.id = "12345"
     mock_user.name = "Test User"
 
-    hass.config_entries.async_update_entry(
+    subentry = next(iter(mock_config_entry.subentries.values()))
+    hass.config_entries.async_update_subentry(
         mock_config_entry,
-        options={
+        subentry,
+        data={
             "prompt": (
                 "The user name is {{ user_name }}. "
                 "The user id is {{ llm_context.context.user_id }}."
@@ -286,7 +292,7 @@ async def test_template_variables(
         await hass.config_entries.async_setup(mock_config_entry.entry_id)
         await hass.async_block_till_done()
         result = await conversation.async_converse(
-            hass, "hello", None, context, agent_id="conversation.claude"
+            hass, "hello", None, context, agent_id="conversation.claude_conversation"
         )
 
     assert result.response.response_type == intent.IntentResponseType.ACTION_DONE
@@ -304,7 +310,9 @@ async def test_conversation_agent(
     mock_init_component,
 ) -> None:
     """Test Anthropic Agent."""
-    agent = conversation.agent_manager.async_get_agent(hass, "conversation.claude")
+    agent = conversation.agent_manager.async_get_agent(
+        hass, "conversation.claude_conversation"
+    )
     assert agent.supported_languages == "*"
 
 
@@ -332,7 +340,7 @@ async def test_function_call(
     expected_call_tool_args: dict[str, Any],
 ) -> None:
     """Test function call from the assistant."""
-    agent_id = "conversation.claude"
+    agent_id = "conversation.claude_conversation"
     context = Context()
 
     mock_tool = AsyncMock()
@@ -430,7 +438,7 @@ async def test_function_exception(
     mock_init_component,
 ) -> None:
     """Test function call with exception."""
-    agent_id = "conversation.claude"
+    agent_id = "conversation.claude_conversation"
     context = Context()
 
     mock_tool = AsyncMock()
@@ -536,7 +544,7 @@ async def test_assist_api_tools_conversion(
     ):
         assert await async_setup_component(hass, component, {})
 
-    agent_id = "conversation.claude"
+    agent_id = "conversation.claude_conversation"
     with patch(
         "anthropic.resources.messages.AsyncMessages.create",
         new_callable=AsyncMock,
@@ -561,17 +569,19 @@ async def test_unknown_hass_api(
     mock_init_component,
 ) -> None:
     """Test when we reference an API that no longer exists."""
-    hass.config_entries.async_update_entry(
+    subentry = next(iter(mock_config_entry.subentries.values()))
+    hass.config_entries.async_update_subentry(
         mock_config_entry,
-        options={
-            **mock_config_entry.options,
+        subentry,
+        data={
+            **subentry.data,
             CONF_LLM_HASS_API: "non-existing",
         },
     )
     await hass.async_block_till_done()
 
     result = await conversation.async_converse(
-        hass, "hello", "1234", Context(), agent_id="conversation.claude"
+        hass, "hello", "1234", Context(), agent_id="conversation.claude_conversation"
     )
 
     assert result == snapshot
@@ -597,17 +607,25 @@ async def test_conversation_id(
         side_effect=create_stream_generator,
     ):
         result = await conversation.async_converse(
-            hass, "hello", "1234", Context(), agent_id="conversation.claude"
+            hass,
+            "hello",
+            "1234",
+            Context(),
+            agent_id="conversation.claude_conversation",
         )
 
         result = await conversation.async_converse(
-            hass, "hello", None, None, agent_id="conversation.claude"
+            hass, "hello", None, None, agent_id="conversation.claude_conversation"
         )
 
         conversation_id = result.conversation_id
 
         result = await conversation.async_converse(
-            hass, "hello", conversation_id, None, agent_id="conversation.claude"
+            hass,
+            "hello",
+            conversation_id,
+            None,
+            agent_id="conversation.claude_conversation",
         )
 
         assert result.conversation_id == conversation_id
@@ -615,13 +633,13 @@ async def test_conversation_id(
         unknown_id = ulid_util.ulid()
 
         result = await conversation.async_converse(
-            hass, "hello", unknown_id, None, agent_id="conversation.claude"
+            hass, "hello", unknown_id, None, agent_id="conversation.claude_conversation"
         )
 
         assert result.conversation_id != unknown_id
 
         result = await conversation.async_converse(
-            hass, "hello", "koala", None, agent_id="conversation.claude"
+            hass, "hello", "koala", None, agent_id="conversation.claude_conversation"
         )
 
         assert result.conversation_id == "koala"
@@ -654,7 +672,7 @@ async def test_refusal(
             "2631EDCF22E8CCC1FB35B501C9C86",
             None,
             Context(),
-            agent_id="conversation.claude",
+            agent_id="conversation.claude_conversation",
         )
 
     assert result.response.response_type == intent.IntentResponseType.ERROR
@@ -695,7 +713,7 @@ async def test_extended_thinking(
         ),
     ):
         result = await conversation.async_converse(
-            hass, "hello", None, Context(), agent_id="conversation.claude"
+            hass, "hello", None, Context(), agent_id="conversation.claude_conversation"
         )
 
     chat_log = hass.data.get(conversation.chat_log.DATA_CHAT_LOGS).get(
@@ -732,7 +750,7 @@ async def test_redacted_thinking(
             "8432ECCCE4C1253D5E2D82641AC0E52CC2876CB",
             None,
             Context(),
-            agent_id="conversation.claude",
+            agent_id="conversation.claude_conversation",
         )
 
     chat_log = hass.data.get(conversation.chat_log.DATA_CHAT_LOGS).get(
@@ -751,7 +769,7 @@ async def test_extended_thinking_tool_call(
     snapshot: SnapshotAssertion,
 ) -> None:
     """Test that thinking blocks and their order are preserved in with tool calls."""
-    agent_id = "conversation.claude"
+    agent_id = "conversation.claude_conversation"
     context = Context()
 
     mock_tool = AsyncMock()
@@ -841,7 +859,8 @@ async def test_extended_thinking_tool_call(
             conversation.chat_log.SystemContent("You are a helpful assistant."),
             conversation.chat_log.UserContent("What shape is a donut?"),
             conversation.chat_log.AssistantContent(
-                agent_id="conversation.claude", content="A donut is a torus."
+                agent_id="conversation.claude_conversation",
+                content="A donut is a torus.",
             ),
         ],
         [
@@ -849,10 +868,11 @@ async def test_extended_thinking_tool_call(
             conversation.chat_log.UserContent("What shape is a donut?"),
             conversation.chat_log.UserContent("Can you tell me?"),
             conversation.chat_log.AssistantContent(
-                agent_id="conversation.claude", content="A donut is a torus."
+                agent_id="conversation.claude_conversation",
+                content="A donut is a torus.",
             ),
             conversation.chat_log.AssistantContent(
-                agent_id="conversation.claude", content="Hope this helps."
+                agent_id="conversation.claude_conversation", content="Hope this helps."
             ),
         ],
         [
@@ -861,20 +881,21 @@ async def test_extended_thinking_tool_call(
             conversation.chat_log.UserContent("Can you tell me?"),
             conversation.chat_log.UserContent("Please?"),
             conversation.chat_log.AssistantContent(
-                agent_id="conversation.claude", content="A donut is a torus."
+                agent_id="conversation.claude_conversation",
+                content="A donut is a torus.",
             ),
             conversation.chat_log.AssistantContent(
-                agent_id="conversation.claude", content="Hope this helps."
+                agent_id="conversation.claude_conversation", content="Hope this helps."
             ),
             conversation.chat_log.AssistantContent(
-                agent_id="conversation.claude", content="You are welcome."
+                agent_id="conversation.claude_conversation", content="You are welcome."
             ),
         ],
         [
             conversation.chat_log.SystemContent("You are a helpful assistant."),
             conversation.chat_log.UserContent("Turn off the lights and make me coffee"),
             conversation.chat_log.AssistantContent(
-                agent_id="conversation.claude",
+                agent_id="conversation.claude_conversation",
                 content="Sure.",
                 tool_calls=[
                     llm.ToolInput(
@@ -891,19 +912,19 @@ async def test_extended_thinking_tool_call(
             ),
             conversation.chat_log.UserContent("Thank you"),
             conversation.chat_log.ToolResultContent(
-                agent_id="conversation.claude",
+                agent_id="conversation.claude_conversation",
                 tool_call_id="mock-tool-call-id",
                 tool_name="HassTurnOff",
                 tool_result={"success": True, "response": "Lights are off."},
             ),
             conversation.chat_log.ToolResultContent(
-                agent_id="conversation.claude",
+                agent_id="conversation.claude_conversation",
                 tool_call_id="mock-tool-call-id-2",
                 tool_name="MakeCoffee",
                 tool_result={"success": False, "response": "Not enough milk."},
             ),
             conversation.chat_log.AssistantContent(
-                agent_id="conversation.claude",
+                agent_id="conversation.claude_conversation",
                 content="Should I add milk to the shopping list?",
             ),
         ],
@@ -940,7 +961,7 @@ async def test_history_conversion(
             "Are you sure?",
             conversation_id,
             Context(),
-            agent_id="conversation.claude",
+            agent_id="conversation.claude_conversation",
         )
 
         assert mock_create.mock_calls[0][2]["messages"] == snapshot
diff --git a/tests/components/anthropic/test_init.py b/tests/components/anthropic/test_init.py
index 305e442f52d..6295bac67cb 100644
--- a/tests/components/anthropic/test_init.py
+++ b/tests/components/anthropic/test_init.py
@@ -11,7 +11,9 @@ from anthropic import (
 from httpx import URL, Request, Response
 import pytest
 
+from homeassistant.components.anthropic.const import DOMAIN
 from homeassistant.core import HomeAssistant
+from homeassistant.helpers import device_registry as dr, entity_registry as er
 from homeassistant.setup import async_setup_component
 
 from tests.common import MockConfigEntry
@@ -61,3 +63,269 @@ async def test_init_error(
         assert await async_setup_component(hass, "anthropic", {})
         await hass.async_block_till_done()
         assert error in caplog.text
+
+
+async def test_migration_from_v1_to_v2(
+    hass: HomeAssistant,
+    device_registry: dr.DeviceRegistry,
+    entity_registry: er.EntityRegistry,
+) -> None:
+    """Test migration from version 1 to version 2."""
+    # Create a v1 config entry with conversation options and an entity
+    OPTIONS = {
+        "recommended": True,
+        "llm_hass_api": ["assist"],
+        "prompt": "You are a helpful assistant",
+        "chat_model": "claude-3-haiku-20240307",
+    }
+    mock_config_entry = MockConfigEntry(
+        domain=DOMAIN,
+        data={"api_key": "1234"},
+        options=OPTIONS,
+        version=1,
+        title="Claude",
+    )
+    mock_config_entry.add_to_hass(hass)
+
+    device = device_registry.async_get_or_create(
+        config_entry_id=mock_config_entry.entry_id,
+        identifiers={(DOMAIN, mock_config_entry.entry_id)},
+        name=mock_config_entry.title,
+        manufacturer="Anthropic",
+        model="Claude",
+        entry_type=dr.DeviceEntryType.SERVICE,
+    )
+    entity = entity_registry.async_get_or_create(
+        "conversation",
+        DOMAIN,
+        mock_config_entry.entry_id,
+        config_entry=mock_config_entry,
+        device_id=device.id,
+        suggested_object_id="claude",
+    )
+
+    # Run migration
+    with patch(
+        "homeassistant.components.anthropic.async_setup_entry",
+        return_value=True,
+    ):
+        await hass.config_entries.async_setup(mock_config_entry.entry_id)
+        await hass.async_block_till_done()
+
+    assert mock_config_entry.version == 2
+    assert mock_config_entry.data == {"api_key": "1234"}
+    assert mock_config_entry.options == {}
+
+    assert len(mock_config_entry.subentries) == 1
+
+    subentry = next(iter(mock_config_entry.subentries.values()))
+    assert subentry.unique_id is None
+    assert subentry.title == "Claude"
+    assert subentry.subentry_type == "conversation"
+    assert subentry.data == OPTIONS
+
+    migrated_entity = entity_registry.async_get(entity.entity_id)
+    assert migrated_entity is not None
+    assert migrated_entity.config_entry_id == mock_config_entry.entry_id
+    assert migrated_entity.config_subentry_id == subentry.subentry_id
+    assert migrated_entity.unique_id == subentry.subentry_id
+
+    # Check device migration
+    assert not device_registry.async_get_device(
+        identifiers={(DOMAIN, mock_config_entry.entry_id)}
+    )
+    assert (
+        migrated_device := device_registry.async_get_device(
+            identifiers={(DOMAIN, subentry.subentry_id)}
+        )
+    )
+    assert migrated_device.identifiers == {(DOMAIN, subentry.subentry_id)}
+    assert migrated_device.id == device.id
+
+
+async def test_migration_from_v1_to_v2_with_multiple_keys(
+    hass: HomeAssistant,
+    device_registry: dr.DeviceRegistry,
+    entity_registry: er.EntityRegistry,
+) -> None:
+    """Test migration from version 1 to version 2 with different API keys."""
+    # Create two v1 config entries with different API keys
+    options = {
+        "recommended": True,
+        "llm_hass_api": ["assist"],
+        "prompt": "You are a helpful assistant",
+        "chat_model": "claude-3-haiku-20240307",
+    }
+    mock_config_entry = MockConfigEntry(
+        domain=DOMAIN,
+        data={"api_key": "1234"},
+        options=options,
+        version=1,
+        title="Claude 1",
+    )
+    mock_config_entry.add_to_hass(hass)
+    mock_config_entry_2 = MockConfigEntry(
+        domain=DOMAIN,
+        data={"api_key": "12345"},
+        options=options,
+        version=1,
+        title="Claude 2",
+    )
+    mock_config_entry_2.add_to_hass(hass)
+
+    device = device_registry.async_get_or_create(
+        config_entry_id=mock_config_entry.entry_id,
+        identifiers={(DOMAIN, mock_config_entry.entry_id)},
+        name=mock_config_entry.title,
+        manufacturer="Anthropic",
+        model="Claude 1",
+        entry_type=dr.DeviceEntryType.SERVICE,
+    )
+    entity_registry.async_get_or_create(
+        "conversation",
+        DOMAIN,
+        mock_config_entry.entry_id,
+        config_entry=mock_config_entry,
+        device_id=device.id,
+        suggested_object_id="claude_1",
+    )
+
+    device_2 = device_registry.async_get_or_create(
+        config_entry_id=mock_config_entry_2.entry_id,
+        identifiers={(DOMAIN, mock_config_entry_2.entry_id)},
+        name=mock_config_entry_2.title,
+        manufacturer="Anthropic",
+        model="Claude 2",
+        entry_type=dr.DeviceEntryType.SERVICE,
+    )
+    entity_registry.async_get_or_create(
+        "conversation",
+        DOMAIN,
+        mock_config_entry_2.entry_id,
+        config_entry=mock_config_entry_2,
+        device_id=device_2.id,
+        suggested_object_id="claude_2",
+    )
+
+    # Run migration
+    with patch(
+        "homeassistant.components.anthropic.async_setup_entry",
+        return_value=True,
+    ):
+        await hass.config_entries.async_setup(mock_config_entry.entry_id)
+        await hass.async_block_till_done()
+
+    entries = hass.config_entries.async_entries(DOMAIN)
+    assert len(entries) == 2
+
+    for idx, entry in enumerate(entries):
+        assert entry.version == 2
+        assert not entry.options
+        assert len(entry.subentries) == 1
+        subentry = list(entry.subentries.values())[0]
+        assert subentry.subentry_type == "conversation"
+        assert subentry.data == options
+        assert subentry.title == f"Claude {idx + 1}"
+
+        dev = device_registry.async_get_device(
+            identifiers={(DOMAIN, list(entry.subentries.values())[0].subentry_id)}
+        )
+        assert dev is not None
+
+
+async def test_migration_from_v1_to_v2_with_same_keys(
+    hass: HomeAssistant,
+    device_registry: dr.DeviceRegistry,
+    entity_registry: er.EntityRegistry,
+) -> None:
+    """Test migration from version 1 to version 2 with same API keys consolidates entries."""
+    # Create two v1 config entries with the same API key
+    options = {
+        "recommended": True,
+        "llm_hass_api": ["assist"],
+        "prompt": "You are a helpful assistant",
+        "chat_model": "claude-3-haiku-20240307",
+    }
+    mock_config_entry = MockConfigEntry(
+        domain=DOMAIN,
+        data={"api_key": "1234"},
+        options=options,
+        version=1,
+        title="Claude",
+    )
+    mock_config_entry.add_to_hass(hass)
+    mock_config_entry_2 = MockConfigEntry(
+        domain=DOMAIN,
+        data={"api_key": "1234"},  # Same API key
+        options=options,
+        version=1,
+        title="Claude 2",
+    )
+    mock_config_entry_2.add_to_hass(hass)
+
+    device = device_registry.async_get_or_create(
+        config_entry_id=mock_config_entry.entry_id,
+        identifiers={(DOMAIN, mock_config_entry.entry_id)},
+        name=mock_config_entry.title,
+        manufacturer="Anthropic",
+        model="Claude",
+        entry_type=dr.DeviceEntryType.SERVICE,
+    )
+    entity_registry.async_get_or_create(
+        "conversation",
+        DOMAIN,
+        mock_config_entry.entry_id,
+        config_entry=mock_config_entry,
+        device_id=device.id,
+        suggested_object_id="claude",
+    )
+
+    device_2 = device_registry.async_get_or_create(
+        config_entry_id=mock_config_entry_2.entry_id,
+        identifiers={(DOMAIN, mock_config_entry_2.entry_id)},
+        name=mock_config_entry_2.title,
+        manufacturer="Anthropic",
+        model="Claude",
+        entry_type=dr.DeviceEntryType.SERVICE,
+    )
+    entity_registry.async_get_or_create(
+        "conversation",
+        DOMAIN,
+        mock_config_entry_2.entry_id,
+        config_entry=mock_config_entry_2,
+        device_id=device_2.id,
+        suggested_object_id="claude_2",
+    )
+
+    # Run migration
+    with patch(
+        "homeassistant.components.anthropic.async_setup_entry",
+        return_value=True,
+    ):
+        await hass.config_entries.async_setup(mock_config_entry.entry_id)
+        await hass.async_block_till_done()
+
+    # Should have only one entry left (consolidated)
+    entries = hass.config_entries.async_entries(DOMAIN)
+    assert len(entries) == 1
+
+    entry = entries[0]
+    assert entry.version == 2
+    assert not entry.options
+    assert len(entry.subentries) == 2  # Two subentries from the two original entries
+
+    # Check both subentries exist with correct data
+    subentries = list(entry.subentries.values())
+    titles = [sub.title for sub in subentries]
+    assert "Claude" in titles
+    assert "Claude 2" in titles
+
+    for subentry in subentries:
+        assert subentry.subentry_type == "conversation"
+        assert subentry.data == options
+
+        # Check devices were migrated correctly
+        dev = device_registry.async_get_device(
+            identifiers={(DOMAIN, subentry.subentry_id)}
+        )
+        assert dev is not None