diff --git a/homeassistant/components/google_generative_ai_conversation/config_flow.py b/homeassistant/components/google_generative_ai_conversation/config_flow.py
index 551f9b0c9de..ae0f09b1037 100644
--- a/homeassistant/components/google_generative_ai_conversation/config_flow.py
+++ b/homeassistant/components/google_generative_ai_conversation/config_flow.py
@@ -254,11 +254,11 @@ async def google_generative_ai_config_option_schema(
         )
         for api_model in sorted(api_models, key=lambda x: x.display_name or "")
         if (
-            api_model.name != "models/gemini-1.0-pro"  # duplicate of gemini-pro
-            and api_model.display_name
+            api_model.display_name
             and api_model.name
-            and api_model.supported_actions
+            and "tts" not in api_model.name
             and "vision" not in api_model.name
+            and api_model.supported_actions
             and "generateContent" in api_model.supported_actions
         )
     ]
diff --git a/homeassistant/components/google_generative_ai_conversation/conversation.py b/homeassistant/components/google_generative_ai_conversation/conversation.py
index 73a82b98664..c642bfd94e6 100644
--- a/homeassistant/components/google_generative_ai_conversation/conversation.py
+++ b/homeassistant/components/google_generative_ai_conversation/conversation.py
@@ -319,11 +319,10 @@ class GoogleGenerativeAIConversationEntity(
             tools.append(Tool(google_search=GoogleSearch()))
 
         model_name = self.entry.options.get(CONF_CHAT_MODEL, RECOMMENDED_CHAT_MODEL)
-        # Gemini 1.0 doesn't support system_instruction while 1.5 does.
-        # Assume future versions will support it (if not, the request fails with a
-        # clear message at which point we can fix).
+        # Avoid INVALID_ARGUMENT Developer instruction is not enabled for <model>
         supports_system_instruction = (
-            "gemini-1.0" not in model_name and "gemini-pro" not in model_name
+            "gemma" not in model_name
+            and "gemini-2.0-flash-preview-image-generation" not in model_name
         )
 
         prompt_content = cast(