diff --git a/esphome/components/api/api.proto b/esphome/components/api/api.proto
index b0ce21b1ce..2e8c863b87 100644
--- a/esphome/components/api/api.proto
+++ b/esphome/components/api/api.proto
@@ -230,14 +230,16 @@ message DeviceInfoResponse {
 
   uint32 webserver_port = 10 [(field_ifdef) = "USE_WEBSERVER"];
 
-  uint32 legacy_bluetooth_proxy_version = 11 [(field_ifdef) = "USE_BLUETOOTH_PROXY"];
+  // Deprecated in API version 1.9
+  uint32 legacy_bluetooth_proxy_version = 11 [deprecated=true, (field_ifdef) = "USE_BLUETOOTH_PROXY"];
   uint32 bluetooth_proxy_feature_flags = 15 [(field_ifdef) = "USE_BLUETOOTH_PROXY"];
 
   string manufacturer = 12;
 
   string friendly_name = 13;
 
-  uint32 legacy_voice_assistant_version = 14 [(field_ifdef) = "USE_VOICE_ASSISTANT"];
+  // Deprecated in API version 1.10
+  uint32 legacy_voice_assistant_version = 14 [deprecated=true, (field_ifdef) = "USE_VOICE_ASSISTANT"];
   uint32 voice_assistant_feature_flags = 17 [(field_ifdef) = "USE_VOICE_ASSISTANT"];
 
   string suggested_area = 16 [(field_ifdef) = "USE_AREAS"];
@@ -337,6 +339,7 @@ message ListEntitiesCoverResponse {
   uint32 device_id = 13 [(field_ifdef) = "USE_DEVICES"];
 }
 
+// Deprecated in API version 1.1
 enum LegacyCoverState {
   LEGACY_COVER_STATE_OPEN = 0;
   LEGACY_COVER_STATE_CLOSED = 1;
@@ -356,7 +359,8 @@ message CoverStateResponse {
   fixed32 key = 1;
   // legacy: state has been removed in 1.13
   // clients/servers must still send/accept it until the next protocol change
-  LegacyCoverState legacy_state = 2;
+  // Deprecated in API version 1.1
+  LegacyCoverState legacy_state = 2 [deprecated=true];
 
   float position = 3;
   float tilt = 4;
@@ -364,6 +368,7 @@ message CoverStateResponse {
   uint32 device_id = 6 [(field_ifdef) = "USE_DEVICES"];
 }
 
+// Deprecated in API version 1.1
 enum LegacyCoverCommand {
   LEGACY_COVER_COMMAND_OPEN = 0;
   LEGACY_COVER_COMMAND_CLOSE = 1;
@@ -380,8 +385,10 @@ message CoverCommandRequest {
 
   // legacy: command has been removed in 1.13
   // clients/servers must still send/accept it until the next protocol change
-  bool has_legacy_command = 2;
-  LegacyCoverCommand legacy_command = 3;
+  // Deprecated in API version 1.1
+  bool has_legacy_command = 2 [deprecated=true];
+  // Deprecated in API version 1.1
+  LegacyCoverCommand legacy_command = 3 [deprecated=true];
 
   bool has_position = 4;
   float position = 5;
@@ -432,7 +439,8 @@ message FanStateResponse {
   fixed32 key = 1;
   bool state = 2;
   bool oscillating = 3;
-  FanSpeed speed = 4 [deprecated = true];
+  // Deprecated in API version 1.6
+  FanSpeed speed = 4 [deprecated=true];
   FanDirection direction = 5;
   int32 speed_level = 6;
   string preset_mode = 7;
@@ -448,8 +456,10 @@ message FanCommandRequest {
   fixed32 key = 1;
   bool has_state = 2;
   bool state = 3;
-  bool has_speed = 4 [deprecated = true];
-  FanSpeed speed = 5 [deprecated = true];
+  // Deprecated in API version 1.6
+  bool has_speed = 4 [deprecated=true];
+  // Deprecated in API version 1.6
+  FanSpeed speed = 5 [deprecated=true];
   bool has_oscillating = 6;
   bool oscillating = 7;
   bool has_direction = 8;
@@ -488,9 +498,13 @@ message ListEntitiesLightResponse {
 
   repeated ColorMode supported_color_modes = 12;
   // next four supports_* are for legacy clients, newer clients should use color modes
+  // Deprecated in API version 1.6
   bool legacy_supports_brightness = 5 [deprecated=true];
+  // Deprecated in API version 1.6
   bool legacy_supports_rgb = 6 [deprecated=true];
+  // Deprecated in API version 1.6
   bool legacy_supports_white_value = 7 [deprecated=true];
+  // Deprecated in API version 1.6
   bool legacy_supports_color_temperature = 8 [deprecated=true];
   float min_mireds = 9;
   float max_mireds = 10;
@@ -567,6 +581,7 @@ enum SensorStateClass {
   STATE_CLASS_TOTAL = 3;
 }
 
+// Deprecated in API version 1.5
 enum SensorLastResetType {
   LAST_RESET_NONE = 0;
   LAST_RESET_NEVER = 1;
@@ -591,7 +606,8 @@ message ListEntitiesSensorResponse {
   string device_class = 9;
   SensorStateClass state_class = 10;
   // Last reset type removed in 2021.9.0
-  SensorLastResetType legacy_last_reset_type = 11;
+  // Deprecated in API version 1.5
+  SensorLastResetType legacy_last_reset_type = 11 [deprecated=true];
   bool disabled_by_default = 12;
   EntityCategory entity_category = 13;
   uint32 device_id = 14 [(field_ifdef) = "USE_DEVICES"];
@@ -947,7 +963,8 @@ message ListEntitiesClimateResponse {
   float visual_target_temperature_step = 10;
   // for older peer versions - in new system this
   // is if CLIMATE_PRESET_AWAY exists is supported_presets
-  bool legacy_supports_away = 11;
+  // Deprecated in API version 1.5
+  bool legacy_supports_away = 11 [deprecated=true];
   bool supports_action = 12;
   repeated ClimateFanMode supported_fan_modes = 13;
   repeated ClimateSwingMode supported_swing_modes = 14;
@@ -978,7 +995,8 @@ message ClimateStateResponse {
   float target_temperature_low = 5;
   float target_temperature_high = 6;
   // For older peers, equal to preset == CLIMATE_PRESET_AWAY
-  bool unused_legacy_away = 7;
+  // Deprecated in API version 1.5
+  bool unused_legacy_away = 7 [deprecated=true];
   ClimateAction action = 8;
   ClimateFanMode fan_mode = 9;
   ClimateSwingMode swing_mode = 10;
@@ -1006,8 +1024,10 @@ message ClimateCommandRequest {
   bool has_target_temperature_high = 8;
   float target_temperature_high = 9;
   // legacy, for older peers, newer ones should use CLIMATE_PRESET_AWAY in preset
-  bool unused_has_legacy_away = 10;
-  bool unused_legacy_away = 11;
+  // Deprecated in API version 1.5
+  bool unused_has_legacy_away = 10 [deprecated=true];
+  // Deprecated in API version 1.5
+  bool unused_legacy_away = 11 [deprecated=true];
   bool has_fan_mode = 12;
   ClimateFanMode fan_mode = 13;
   bool has_swing_mode = 14;
@@ -1356,7 +1376,8 @@ message SubscribeBluetoothLEAdvertisementsRequest {
 
 message BluetoothServiceData {
   string uuid = 1;
-  repeated uint32 legacy_data = 2 [deprecated = true];  // Removed in api version 1.7
+  // Deprecated in API version 1.7
+  repeated uint32 legacy_data = 2 [deprecated=true];  // Removed in api version 1.7
   bytes data = 3;  // Added in api version 1.7
 }
 message BluetoothLEAdvertisementResponse {
diff --git a/esphome/components/api/api_pb2.cpp b/esphome/components/api/api_pb2.cpp
index 437c9ece1d..44e3a3205b 100644
--- a/esphome/components/api/api_pb2.cpp
+++ b/esphome/components/api/api_pb2.cpp
@@ -94,17 +94,11 @@ void DeviceInfoResponse::encode(ProtoWriteBuffer buffer) const {
 #ifdef USE_WEBSERVER
   buffer.encode_uint32(10, this->webserver_port);
 #endif
-#ifdef USE_BLUETOOTH_PROXY
-  buffer.encode_uint32(11, this->legacy_bluetooth_proxy_version);
-#endif
 #ifdef USE_BLUETOOTH_PROXY
   buffer.encode_uint32(15, this->bluetooth_proxy_feature_flags);
 #endif
   buffer.encode_string(12, this->manufacturer);
   buffer.encode_string(13, this->friendly_name);
-#ifdef USE_VOICE_ASSISTANT
-  buffer.encode_uint32(14, this->legacy_voice_assistant_version);
-#endif
 #ifdef USE_VOICE_ASSISTANT
   buffer.encode_uint32(17, this->voice_assistant_feature_flags);
 #endif
@@ -150,17 +144,11 @@ void DeviceInfoResponse::calculate_size(uint32_t &total_size) const {
 #ifdef USE_WEBSERVER
   ProtoSize::add_uint32_field(total_size, 1, this->webserver_port);
 #endif
-#ifdef USE_BLUETOOTH_PROXY
-  ProtoSize::add_uint32_field(total_size, 1, this->legacy_bluetooth_proxy_version);
-#endif
 #ifdef USE_BLUETOOTH_PROXY
   ProtoSize::add_uint32_field(total_size, 1, this->bluetooth_proxy_feature_flags);
 #endif
   ProtoSize::add_string_field(total_size, 1, this->manufacturer);
   ProtoSize::add_string_field(total_size, 1, this->friendly_name);
-#ifdef USE_VOICE_ASSISTANT
-  ProtoSize::add_uint32_field(total_size, 1, this->legacy_voice_assistant_version);
-#endif
 #ifdef USE_VOICE_ASSISTANT
   ProtoSize::add_uint32_field(total_size, 2, this->voice_assistant_feature_flags);
 #endif
@@ -270,7 +258,6 @@ void ListEntitiesCoverResponse::calculate_size(uint32_t &total_size) const {
 }
 void CoverStateResponse::encode(ProtoWriteBuffer buffer) const {
   buffer.encode_fixed32(1, this->key);
-  buffer.encode_uint32(2, static_cast<uint32_t>(this->legacy_state));
   buffer.encode_float(3, this->position);
   buffer.encode_float(4, this->tilt);
   buffer.encode_uint32(5, static_cast<uint32_t>(this->current_operation));
@@ -280,7 +267,6 @@ void CoverStateResponse::encode(ProtoWriteBuffer buffer) const {
 }
 void CoverStateResponse::calculate_size(uint32_t &total_size) const {
   ProtoSize::add_fixed32_field(total_size, 1, this->key);
-  ProtoSize::add_enum_field(total_size, 1, static_cast<uint32_t>(this->legacy_state));
   ProtoSize::add_float_field(total_size, 1, this->position);
   ProtoSize::add_float_field(total_size, 1, this->tilt);
   ProtoSize::add_enum_field(total_size, 1, static_cast<uint32_t>(this->current_operation));
@@ -290,12 +276,6 @@ void CoverStateResponse::calculate_size(uint32_t &total_size) const {
 }
 bool CoverCommandRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
   switch (field_id) {
-    case 2:
-      this->has_legacy_command = value.as_bool();
-      break;
-    case 3:
-      this->legacy_command = static_cast<enums::LegacyCoverCommand>(value.as_uint32());
-      break;
     case 4:
       this->has_position = value.as_bool();
       break;
@@ -379,7 +359,6 @@ void FanStateResponse::encode(ProtoWriteBuffer buffer) const {
   buffer.encode_fixed32(1, this->key);
   buffer.encode_bool(2, this->state);
   buffer.encode_bool(3, this->oscillating);
-  buffer.encode_uint32(4, static_cast<uint32_t>(this->speed));
   buffer.encode_uint32(5, static_cast<uint32_t>(this->direction));
   buffer.encode_int32(6, this->speed_level);
   buffer.encode_string(7, this->preset_mode);
@@ -391,7 +370,6 @@ void FanStateResponse::calculate_size(uint32_t &total_size) const {
   ProtoSize::add_fixed32_field(total_size, 1, this->key);
   ProtoSize::add_bool_field(total_size, 1, this->state);
   ProtoSize::add_bool_field(total_size, 1, this->oscillating);
-  ProtoSize::add_enum_field(total_size, 1, static_cast<uint32_t>(this->speed));
   ProtoSize::add_enum_field(total_size, 1, static_cast<uint32_t>(this->direction));
   ProtoSize::add_int32_field(total_size, 1, this->speed_level);
   ProtoSize::add_string_field(total_size, 1, this->preset_mode);
@@ -407,12 +385,6 @@ bool FanCommandRequest::decode_varint(uint32_t field_id, ProtoVarInt value) {
     case 3:
       this->state = value.as_bool();
       break;
-    case 4:
-      this->has_speed = value.as_bool();
-      break;
-    case 5:
-      this->speed = static_cast<enums::FanSpeed>(value.as_uint32());
-      break;
     case 6:
       this->has_oscillating = value.as_bool();
       break;
@@ -473,10 +445,6 @@ void ListEntitiesLightResponse::encode(ProtoWriteBuffer buffer) const {
   for (auto &it : this->supported_color_modes) {
     buffer.encode_uint32(12, static_cast<uint32_t>(it), true);
   }
-  buffer.encode_bool(5, this->legacy_supports_brightness);
-  buffer.encode_bool(6, this->legacy_supports_rgb);
-  buffer.encode_bool(7, this->legacy_supports_white_value);
-  buffer.encode_bool(8, this->legacy_supports_color_temperature);
   buffer.encode_float(9, this->min_mireds);
   buffer.encode_float(10, this->max_mireds);
   for (auto &it : this->effects) {
@@ -500,10 +468,6 @@ void ListEntitiesLightResponse::calculate_size(uint32_t &total_size) const {
       ProtoSize::add_enum_field_repeated(total_size, 1, static_cast<uint32_t>(it));
     }
   }
-  ProtoSize::add_bool_field(total_size, 1, this->legacy_supports_brightness);
-  ProtoSize::add_bool_field(total_size, 1, this->legacy_supports_rgb);
-  ProtoSize::add_bool_field(total_size, 1, this->legacy_supports_white_value);
-  ProtoSize::add_bool_field(total_size, 1, this->legacy_supports_color_temperature);
   ProtoSize::add_float_field(total_size, 1, this->min_mireds);
   ProtoSize::add_float_field(total_size, 1, this->max_mireds);
   if (!this->effects.empty()) {
@@ -677,7 +641,6 @@ void ListEntitiesSensorResponse::encode(ProtoWriteBuffer buffer) const {
   buffer.encode_bool(8, this->force_update);
   buffer.encode_string(9, this->device_class);
   buffer.encode_uint32(10, static_cast<uint32_t>(this->state_class));
-  buffer.encode_uint32(11, static_cast<uint32_t>(this->legacy_last_reset_type));
   buffer.encode_bool(12, this->disabled_by_default);
   buffer.encode_uint32(13, static_cast<uint32_t>(this->entity_category));
 #ifdef USE_DEVICES
@@ -696,7 +659,6 @@ void ListEntitiesSensorResponse::calculate_size(uint32_t &total_size) const {
   ProtoSize::add_bool_field(total_size, 1, this->force_update);
   ProtoSize::add_string_field(total_size, 1, this->device_class);
   ProtoSize::add_enum_field(total_size, 1, static_cast<uint32_t>(this->state_class));
-  ProtoSize::add_enum_field(total_size, 1, static_cast<uint32_t>(this->legacy_last_reset_type));
   ProtoSize::add_bool_field(total_size, 1, this->disabled_by_default);
   ProtoSize::add_enum_field(total_size, 1, static_cast<uint32_t>(this->entity_category));
 #ifdef USE_DEVICES
@@ -1105,7 +1067,6 @@ void ListEntitiesClimateResponse::encode(ProtoWriteBuffer buffer) const {
   buffer.encode_float(8, this->visual_min_temperature);
   buffer.encode_float(9, this->visual_max_temperature);
   buffer.encode_float(10, this->visual_target_temperature_step);
-  buffer.encode_bool(11, this->legacy_supports_away);
   buffer.encode_bool(12, this->supports_action);
   for (auto &it : this->supported_fan_modes) {
     buffer.encode_uint32(13, static_cast<uint32_t>(it), true);
@@ -1150,7 +1111,6 @@ void ListEntitiesClimateResponse::calculate_size(uint32_t &total_size) const {
   ProtoSize::add_float_field(total_size, 1, this->visual_min_temperature);
   ProtoSize::add_float_field(total_size, 1, this->visual_max_temperature);
   ProtoSize::add_float_field(total_size, 1, this->visual_target_temperature_step);
-  ProtoSize::add_bool_field(total_size, 1, this->legacy_supports_away);
   ProtoSize::add_bool_field(total_size, 1, this->supports_action);
   if (!this->supported_fan_modes.empty()) {
     for (const auto &it : this->supported_fan_modes) {
@@ -1198,7 +1158,6 @@ void ClimateStateResponse::encode(ProtoWriteBuffer buffer) const {
   buffer.encode_float(4, this->target_temperature);
   buffer.encode_float(5, this->target_temperature_low);
   buffer.encode_float(6, this->target_temperature_high);
-  buffer.encode_bool(7, this->unused_legacy_away);
   buffer.encode_uint32(8, static_cast<uint32_t>(this->action));
   buffer.encode_uint32(9, static_cast<uint32_t>(this->fan_mode));
   buffer.encode_uint32(10, static_cast<uint32_t>(this->swing_mode));
@@ -1218,7 +1177,6 @@ void ClimateStateResponse::calculate_size(uint32_t &total_size) const {
   ProtoSize::add_float_field(total_size, 1, this->target_temperature);
   ProtoSize::add_float_field(total_size, 1, this->target_temperature_low);
   ProtoSize::add_float_field(total_size, 1, this->target_temperature_high);
-  ProtoSize::add_bool_field(total_size, 1, this->unused_legacy_away);
   ProtoSize::add_enum_field(total_size, 1, static_cast<uint32_t>(this->action));
   ProtoSize::add_enum_field(total_size, 1, static_cast<uint32_t>(this->fan_mode));
   ProtoSize::add_enum_field(total_size, 1, static_cast<uint32_t>(this->swing_mode));
@@ -1248,12 +1206,6 @@ bool ClimateCommandRequest::decode_varint(uint32_t field_id, ProtoVarInt value)
     case 8:
       this->has_target_temperature_high = value.as_bool();
       break;
-    case 10:
-      this->unused_has_legacy_away = value.as_bool();
-      break;
-    case 11:
-      this->unused_legacy_away = value.as_bool();
-      break;
     case 12:
       this->has_fan_mode = value.as_bool();
       break;
@@ -1871,18 +1823,10 @@ bool SubscribeBluetoothLEAdvertisementsRequest::decode_varint(uint32_t field_id,
 }
 void BluetoothServiceData::encode(ProtoWriteBuffer buffer) const {
   buffer.encode_string(1, this->uuid);
-  for (auto &it : this->legacy_data) {
-    buffer.encode_uint32(2, it, true);
-  }
   buffer.encode_bytes(3, reinterpret_cast<const uint8_t *>(this->data.data()), this->data.size());
 }
 void BluetoothServiceData::calculate_size(uint32_t &total_size) const {
   ProtoSize::add_string_field(total_size, 1, this->uuid);
-  if (!this->legacy_data.empty()) {
-    for (const auto &it : this->legacy_data) {
-      ProtoSize::add_uint32_field_repeated(total_size, 1, it);
-    }
-  }
   ProtoSize::add_string_field(total_size, 1, this->data);
 }
 void BluetoothLEAdvertisementResponse::encode(ProtoWriteBuffer buffer) const {
diff --git a/esphome/components/api/api_pb2.h b/esphome/components/api/api_pb2.h
index 39f00b4adc..a9fe3cb538 100644
--- a/esphome/components/api/api_pb2.h
+++ b/esphome/components/api/api_pb2.h
@@ -477,7 +477,7 @@ class DeviceInfo : public ProtoMessage {
 class DeviceInfoResponse : public ProtoMessage {
  public:
   static constexpr uint8_t MESSAGE_TYPE = 10;
-  static constexpr uint8_t ESTIMATED_SIZE = 219;
+  static constexpr uint8_t ESTIMATED_SIZE = 211;
 #ifdef HAS_PROTO_MESSAGE_DUMP
   const char *message_name() const override { return "device_info_response"; }
 #endif
@@ -499,17 +499,11 @@ class DeviceInfoResponse : public ProtoMessage {
 #ifdef USE_WEBSERVER
   uint32_t webserver_port{0};
 #endif
-#ifdef USE_BLUETOOTH_PROXY
-  uint32_t legacy_bluetooth_proxy_version{0};
-#endif
 #ifdef USE_BLUETOOTH_PROXY
   uint32_t bluetooth_proxy_feature_flags{0};
 #endif
   std::string manufacturer{};
   std::string friendly_name{};
-#ifdef USE_VOICE_ASSISTANT
-  uint32_t legacy_voice_assistant_version{0};
-#endif
 #ifdef USE_VOICE_ASSISTANT
   uint32_t voice_assistant_feature_flags{0};
 #endif
@@ -638,11 +632,10 @@ class ListEntitiesCoverResponse : public InfoResponseProtoMessage {
 class CoverStateResponse : public StateResponseProtoMessage {
  public:
   static constexpr uint8_t MESSAGE_TYPE = 22;
-  static constexpr uint8_t ESTIMATED_SIZE = 23;
+  static constexpr uint8_t ESTIMATED_SIZE = 21;
 #ifdef HAS_PROTO_MESSAGE_DUMP
   const char *message_name() const override { return "cover_state_response"; }
 #endif
-  enums::LegacyCoverState legacy_state{};
   float position{0.0f};
   float tilt{0.0f};
   enums::CoverOperation current_operation{};
@@ -657,12 +650,10 @@ class CoverStateResponse : public StateResponseProtoMessage {
 class CoverCommandRequest : public CommandProtoMessage {
  public:
   static constexpr uint8_t MESSAGE_TYPE = 30;
-  static constexpr uint8_t ESTIMATED_SIZE = 29;
+  static constexpr uint8_t ESTIMATED_SIZE = 25;
 #ifdef HAS_PROTO_MESSAGE_DUMP
   const char *message_name() const override { return "cover_command_request"; }
 #endif
-  bool has_legacy_command{false};
-  enums::LegacyCoverCommand legacy_command{};
   bool has_position{false};
   float position{0.0f};
   bool has_tilt{false};
@@ -701,13 +692,12 @@ class ListEntitiesFanResponse : public InfoResponseProtoMessage {
 class FanStateResponse : public StateResponseProtoMessage {
  public:
   static constexpr uint8_t MESSAGE_TYPE = 23;
-  static constexpr uint8_t ESTIMATED_SIZE = 30;
+  static constexpr uint8_t ESTIMATED_SIZE = 28;
 #ifdef HAS_PROTO_MESSAGE_DUMP
   const char *message_name() const override { return "fan_state_response"; }
 #endif
   bool state{false};
   bool oscillating{false};
-  enums::FanSpeed speed{};
   enums::FanDirection direction{};
   int32_t speed_level{0};
   std::string preset_mode{};
@@ -722,14 +712,12 @@ class FanStateResponse : public StateResponseProtoMessage {
 class FanCommandRequest : public CommandProtoMessage {
  public:
   static constexpr uint8_t MESSAGE_TYPE = 31;
-  static constexpr uint8_t ESTIMATED_SIZE = 42;
+  static constexpr uint8_t ESTIMATED_SIZE = 38;
 #ifdef HAS_PROTO_MESSAGE_DUMP
   const char *message_name() const override { return "fan_command_request"; }
 #endif
   bool has_state{false};
   bool state{false};
-  bool has_speed{false};
-  enums::FanSpeed speed{};
   bool has_oscillating{false};
   bool oscillating{false};
   bool has_direction{false};
@@ -752,15 +740,11 @@ class FanCommandRequest : public CommandProtoMessage {
 class ListEntitiesLightResponse : public InfoResponseProtoMessage {
  public:
   static constexpr uint8_t MESSAGE_TYPE = 15;
-  static constexpr uint8_t ESTIMATED_SIZE = 81;
+  static constexpr uint8_t ESTIMATED_SIZE = 73;
 #ifdef HAS_PROTO_MESSAGE_DUMP
   const char *message_name() const override { return "list_entities_light_response"; }
 #endif
   std::vector<enums::ColorMode> supported_color_modes{};
-  bool legacy_supports_brightness{false};
-  bool legacy_supports_rgb{false};
-  bool legacy_supports_white_value{false};
-  bool legacy_supports_color_temperature{false};
   float min_mireds{0.0f};
   float max_mireds{0.0f};
   std::vector<std::string> effects{};
@@ -846,7 +830,7 @@ class LightCommandRequest : public CommandProtoMessage {
 class ListEntitiesSensorResponse : public InfoResponseProtoMessage {
  public:
   static constexpr uint8_t MESSAGE_TYPE = 16;
-  static constexpr uint8_t ESTIMATED_SIZE = 68;
+  static constexpr uint8_t ESTIMATED_SIZE = 66;
 #ifdef HAS_PROTO_MESSAGE_DUMP
   const char *message_name() const override { return "list_entities_sensor_response"; }
 #endif
@@ -855,7 +839,6 @@ class ListEntitiesSensorResponse : public InfoResponseProtoMessage {
   bool force_update{false};
   std::string device_class{};
   enums::SensorStateClass state_class{};
-  enums::SensorLastResetType legacy_last_reset_type{};
   void encode(ProtoWriteBuffer buffer) const override;
   void calculate_size(uint32_t &total_size) const override;
 #ifdef HAS_PROTO_MESSAGE_DUMP
@@ -1281,7 +1264,7 @@ class CameraImageRequest : public ProtoDecodableMessage {
 class ListEntitiesClimateResponse : public InfoResponseProtoMessage {
  public:
   static constexpr uint8_t MESSAGE_TYPE = 46;
-  static constexpr uint8_t ESTIMATED_SIZE = 147;
+  static constexpr uint8_t ESTIMATED_SIZE = 145;
 #ifdef HAS_PROTO_MESSAGE_DUMP
   const char *message_name() const override { return "list_entities_climate_response"; }
 #endif
@@ -1291,7 +1274,6 @@ class ListEntitiesClimateResponse : public InfoResponseProtoMessage {
   float visual_min_temperature{0.0f};
   float visual_max_temperature{0.0f};
   float visual_target_temperature_step{0.0f};
-  bool legacy_supports_away{false};
   bool supports_action{false};
   std::vector<enums::ClimateFanMode> supported_fan_modes{};
   std::vector<enums::ClimateSwingMode> supported_swing_modes{};
@@ -1314,7 +1296,7 @@ class ListEntitiesClimateResponse : public InfoResponseProtoMessage {
 class ClimateStateResponse : public StateResponseProtoMessage {
  public:
   static constexpr uint8_t MESSAGE_TYPE = 47;
-  static constexpr uint8_t ESTIMATED_SIZE = 70;
+  static constexpr uint8_t ESTIMATED_SIZE = 68;
 #ifdef HAS_PROTO_MESSAGE_DUMP
   const char *message_name() const override { return "climate_state_response"; }
 #endif
@@ -1323,7 +1305,6 @@ class ClimateStateResponse : public StateResponseProtoMessage {
   float target_temperature{0.0f};
   float target_temperature_low{0.0f};
   float target_temperature_high{0.0f};
-  bool unused_legacy_away{false};
   enums::ClimateAction action{};
   enums::ClimateFanMode fan_mode{};
   enums::ClimateSwingMode swing_mode{};
@@ -1343,7 +1324,7 @@ class ClimateStateResponse : public StateResponseProtoMessage {
 class ClimateCommandRequest : public CommandProtoMessage {
  public:
   static constexpr uint8_t MESSAGE_TYPE = 48;
-  static constexpr uint8_t ESTIMATED_SIZE = 88;
+  static constexpr uint8_t ESTIMATED_SIZE = 84;
 #ifdef HAS_PROTO_MESSAGE_DUMP
   const char *message_name() const override { return "climate_command_request"; }
 #endif
@@ -1355,8 +1336,6 @@ class ClimateCommandRequest : public CommandProtoMessage {
   float target_temperature_low{0.0f};
   bool has_target_temperature_high{false};
   float target_temperature_high{0.0f};
-  bool unused_has_legacy_away{false};
-  bool unused_legacy_away{false};
   bool has_fan_mode{false};
   enums::ClimateFanMode fan_mode{};
   bool has_swing_mode{false};
@@ -1731,7 +1710,6 @@ class SubscribeBluetoothLEAdvertisementsRequest : public ProtoDecodableMessage {
 class BluetoothServiceData : public ProtoMessage {
  public:
   std::string uuid{};
-  std::vector<uint32_t> legacy_data{};
   std::string data{};
   void encode(ProtoWriteBuffer buffer) const override;
   void calculate_size(uint32_t &total_size) const override;
diff --git a/esphome/components/api/api_pb2_dump.cpp b/esphome/components/api/api_pb2_dump.cpp
index ad5a5fdcaa..35d5e2e91c 100644
--- a/esphome/components/api/api_pb2_dump.cpp
+++ b/esphome/components/api/api_pb2_dump.cpp
@@ -737,13 +737,6 @@ void DeviceInfoResponse::dump_to(std::string &out) const {
   out.append(buffer);
   out.append("\n");
 
-#endif
-#ifdef USE_BLUETOOTH_PROXY
-  out.append("  legacy_bluetooth_proxy_version: ");
-  snprintf(buffer, sizeof(buffer), "%" PRIu32, this->legacy_bluetooth_proxy_version);
-  out.append(buffer);
-  out.append("\n");
-
 #endif
 #ifdef USE_BLUETOOTH_PROXY
   out.append("  bluetooth_proxy_feature_flags: ");
@@ -760,13 +753,6 @@ void DeviceInfoResponse::dump_to(std::string &out) const {
   out.append("'").append(this->friendly_name).append("'");
   out.append("\n");
 
-#ifdef USE_VOICE_ASSISTANT
-  out.append("  legacy_voice_assistant_version: ");
-  snprintf(buffer, sizeof(buffer), "%" PRIu32, this->legacy_voice_assistant_version);
-  out.append(buffer);
-  out.append("\n");
-
-#endif
 #ifdef USE_VOICE_ASSISTANT
   out.append("  voice_assistant_feature_flags: ");
   snprintf(buffer, sizeof(buffer), "%" PRIu32, this->voice_assistant_feature_flags);
@@ -961,10 +947,6 @@ void CoverStateResponse::dump_to(std::string &out) const {
   out.append(buffer);
   out.append("\n");
 
-  out.append("  legacy_state: ");
-  out.append(proto_enum_to_string<enums::LegacyCoverState>(this->legacy_state));
-  out.append("\n");
-
   out.append("  position: ");
   snprintf(buffer, sizeof(buffer), "%g", this->position);
   out.append(buffer);
@@ -996,14 +978,6 @@ void CoverCommandRequest::dump_to(std::string &out) const {
   out.append(buffer);
   out.append("\n");
 
-  out.append("  has_legacy_command: ");
-  out.append(YESNO(this->has_legacy_command));
-  out.append("\n");
-
-  out.append("  legacy_command: ");
-  out.append(proto_enum_to_string<enums::LegacyCoverCommand>(this->legacy_command));
-  out.append("\n");
-
   out.append("  has_position: ");
   out.append(YESNO(this->has_position));
   out.append("\n");
@@ -1115,10 +1089,6 @@ void FanStateResponse::dump_to(std::string &out) const {
   out.append(YESNO(this->oscillating));
   out.append("\n");
 
-  out.append("  speed: ");
-  out.append(proto_enum_to_string<enums::FanSpeed>(this->speed));
-  out.append("\n");
-
   out.append("  direction: ");
   out.append(proto_enum_to_string<enums::FanDirection>(this->direction));
   out.append("\n");
@@ -1157,14 +1127,6 @@ void FanCommandRequest::dump_to(std::string &out) const {
   out.append(YESNO(this->state));
   out.append("\n");
 
-  out.append("  has_speed: ");
-  out.append(YESNO(this->has_speed));
-  out.append("\n");
-
-  out.append("  speed: ");
-  out.append(proto_enum_to_string<enums::FanSpeed>(this->speed));
-  out.append("\n");
-
   out.append("  has_oscillating: ");
   out.append(YESNO(this->has_oscillating));
   out.append("\n");
@@ -1231,22 +1193,6 @@ void ListEntitiesLightResponse::dump_to(std::string &out) const {
     out.append("\n");
   }
 
-  out.append("  legacy_supports_brightness: ");
-  out.append(YESNO(this->legacy_supports_brightness));
-  out.append("\n");
-
-  out.append("  legacy_supports_rgb: ");
-  out.append(YESNO(this->legacy_supports_rgb));
-  out.append("\n");
-
-  out.append("  legacy_supports_white_value: ");
-  out.append(YESNO(this->legacy_supports_white_value));
-  out.append("\n");
-
-  out.append("  legacy_supports_color_temperature: ");
-  out.append(YESNO(this->legacy_supports_color_temperature));
-  out.append("\n");
-
   out.append("  min_mireds: ");
   snprintf(buffer, sizeof(buffer), "%g", this->min_mireds);
   out.append(buffer);
@@ -1537,10 +1483,6 @@ void ListEntitiesSensorResponse::dump_to(std::string &out) const {
   out.append(proto_enum_to_string<enums::SensorStateClass>(this->state_class));
   out.append("\n");
 
-  out.append("  legacy_last_reset_type: ");
-  out.append(proto_enum_to_string<enums::SensorLastResetType>(this->legacy_last_reset_type));
-  out.append("\n");
-
   out.append("  disabled_by_default: ");
   out.append(YESNO(this->disabled_by_default));
   out.append("\n");
@@ -2107,10 +2049,6 @@ void ListEntitiesClimateResponse::dump_to(std::string &out) const {
   out.append(buffer);
   out.append("\n");
 
-  out.append("  legacy_supports_away: ");
-  out.append(YESNO(this->legacy_supports_away));
-  out.append("\n");
-
   out.append("  supports_action: ");
   out.append(YESNO(this->supports_action));
   out.append("\n");
@@ -2223,10 +2161,6 @@ void ClimateStateResponse::dump_to(std::string &out) const {
   out.append(buffer);
   out.append("\n");
 
-  out.append("  unused_legacy_away: ");
-  out.append(YESNO(this->unused_legacy_away));
-  out.append("\n");
-
   out.append("  action: ");
   out.append(proto_enum_to_string<enums::ClimateAction>(this->action));
   out.append("\n");
@@ -2313,14 +2247,6 @@ void ClimateCommandRequest::dump_to(std::string &out) const {
   out.append(buffer);
   out.append("\n");
 
-  out.append("  unused_has_legacy_away: ");
-  out.append(YESNO(this->unused_has_legacy_away));
-  out.append("\n");
-
-  out.append("  unused_legacy_away: ");
-  out.append(YESNO(this->unused_legacy_away));
-  out.append("\n");
-
   out.append("  has_fan_mode: ");
   out.append(YESNO(this->has_fan_mode));
   out.append("\n");
@@ -3060,13 +2986,6 @@ void BluetoothServiceData::dump_to(std::string &out) const {
   out.append("'").append(this->uuid).append("'");
   out.append("\n");
 
-  for (const auto &it : this->legacy_data) {
-    out.append("  legacy_data: ");
-    snprintf(buffer, sizeof(buffer), "%" PRIu32, it);
-    out.append(buffer);
-    out.append("\n");
-  }
-
   out.append("  data: ");
   out.append(format_hex_pretty(this->data));
   out.append("\n");
diff --git a/script/api_protobuf/api_protobuf.py b/script/api_protobuf/api_protobuf.py
index 4df7692167..eddaa1b9b2 100755
--- a/script/api_protobuf/api_protobuf.py
+++ b/script/api_protobuf/api_protobuf.py
@@ -1145,6 +1145,10 @@ def calculate_message_estimated_size(desc: descriptor.DescriptorProto) -> int:
     total_size = 0
 
     for field in desc.field:
+        # Skip deprecated fields
+        if field.options.deprecated:
+            continue
+
         ti = create_field_type_info(field)
 
         # Add estimated size for this field
@@ -1213,6 +1217,10 @@ def build_message_type(
         public_content.append("#endif")
 
     for field in desc.field:
+        # Skip deprecated fields completely
+        if field.options.deprecated:
+            continue
+
         ti = create_field_type_info(field)
 
         # Skip field declarations for fields that are in the base class
@@ -1459,8 +1467,10 @@ def find_common_fields(
     if not messages:
         return []
 
-    # Start with fields from the first message
-    first_msg_fields = {field.name: field for field in messages[0].field}
+    # Start with fields from the first message (excluding deprecated fields)
+    first_msg_fields = {
+        field.name: field for field in messages[0].field if not field.options.deprecated
+    }
     common_fields = []
 
     # Check each field to see if it exists in all messages with same type
@@ -1471,6 +1481,9 @@ def find_common_fields(
         for msg in messages[1:]:
             found = False
             for other_field in msg.field:
+                # Skip deprecated fields
+                if other_field.options.deprecated:
+                    continue
                 if (
                     other_field.name == field_name
                     and other_field.type == field.type