Fix forward reference crash in Google and Anthropic LLM ThinkingConfig

ThinkingConfig was defined as an inner class on the service but referenced in the Settings dataclass declared before the service class, causing a crash at import time. Move ThinkingConfig to a standalone class defined before Settings, and keep a class attribute alias for backward compatibility.

src/pipecat/services/anthropic/llm.py

@@ -70,6 +70,25 @@ except ModuleNotFoundError as e:
     raise Exception(f"Missing module: {e}")
 
 
+class AnthropicThinkingConfig(BaseModel):
+    """Configuration for extended thinking.
+
+    Parameters:
+        type: Type of thinking mode (currently only "enabled" or "disabled").
+        budget_tokens: Maximum number of tokens for thinking.
+            With today's models, the minimum is 1024.
+            Only allowed if type is "enabled".
+    """
+
+    # Why `| str` here? To not break compatibility in case Anthropic adds
+    # more types in the future.
+    type: Literal["enabled", "disabled"] | str
+
+    # Why not enforce minimnum of 1024 here? To not break compatibility in
+    # case Anthropic changes this requirement in the future.
+    budget_tokens: int
+
+
 @dataclass
 class AnthropicLLMSettings(LLMSettings):
     """Settings for Anthropic LLM services.
@@ -80,20 +99,18 @@ class AnthropicLLMSettings(LLMSettings):
     """
 
     enable_prompt_caching: bool | _NotGiven = field(default_factory=lambda: _NOT_GIVEN)
-    thinking: "AnthropicLLMService.ThinkingConfig" | _NotGiven = field(
-        default_factory=lambda: _NOT_GIVEN
-    )
+    thinking: AnthropicThinkingConfig | _NotGiven = field(default_factory=lambda: _NOT_GIVEN)
 
     @classmethod
     def from_mapping(cls, settings):
         """Convert a plain dict to settings, coercing thinking dicts.
 
         For backward compatibility, a ``thinking`` value that is a plain dict
-        is converted to a :class:`AnthropicLLMService.ThinkingConfig`.
+        is converted to a :class:`AnthropicThinkingConfig`.
         """
         instance = super().from_mapping(settings)
         if is_given(instance.thinking) and isinstance(instance.thinking, dict):
-            instance.thinking = AnthropicLLMService.ThinkingConfig(**instance.thinking)
+            instance.thinking = AnthropicThinkingConfig(**instance.thinking)
         return instance
 
 
@@ -148,23 +165,8 @@ class AnthropicLLMService(LLMService):
     # Overriding the default adapter to use the Anthropic one.
     adapter_class = AnthropicLLMAdapter
 
-    class ThinkingConfig(BaseModel):
-        """Configuration for extended thinking.
-
-        Parameters:
-            type: Type of thinking mode (currently only "enabled" or "disabled").
-            budget_tokens: Maximum number of tokens for thinking.
-                With today's models, the minimum is 1024.
-                Only allowed if type is "enabled".
-        """
-
-        # Why `| str` here? To not break compatibility in case Anthropic adds
-        # more types in the future.
-        type: Literal["enabled", "disabled"] | str
-
-        # Why not enforce minimnum of 1024 here? To not break compatibility in
-        # case Anthropic changes this requirement in the future.
-        budget_tokens: int
+    # Backward compatibility: ThinkingConfig used to be defined inline here.
+    ThinkingConfig = AnthropicThinkingConfig
 
     class InputParams(BaseModel):
         """Input parameters for Anthropic model inference.
@@ -193,9 +195,7 @@ class AnthropicLLMService(LLMService):
         temperature: Optional[float] = Field(default_factory=lambda: NOT_GIVEN, ge=0.0, le=1.0)
         top_k: Optional[int] = Field(default_factory=lambda: NOT_GIVEN, ge=0)
         top_p: Optional[float] = Field(default_factory=lambda: NOT_GIVEN, ge=0.0, le=1.0)
-        thinking: Optional["AnthropicLLMService.ThinkingConfig"] = Field(
-            default_factory=lambda: NOT_GIVEN
-        )
+        thinking: Optional[AnthropicThinkingConfig] = Field(default_factory=lambda: NOT_GIVEN)
         extra: Optional[Dict[str, Any]] = Field(default_factory=dict)
 
         def model_post_init(self, __context):

src/pipecat/services/google/llm.py

@@ -673,45 +673,7 @@ class GoogleLLMContext(OpenAILLMContext):
         self._messages = [m for m in self._messages if m.parts]
 
 
-@dataclass
-class GoogleLLMSettings(LLMSettings):
-    """Settings for Google LLM services.
-
-    Parameters:
-        thinking: Thinking configuration.
-    """
-
-    thinking: "GoogleLLMService.ThinkingConfig" | _NotGiven = field(
-        default_factory=lambda: NOT_GIVEN
-    )
-
-    @classmethod
-    def from_mapping(cls, settings):
-        """Convert a plain dict to settings, coercing thinking dicts.
-
-        For backward compatibility, a ``thinking`` value that is a plain dict
-        is converted to a :class:`GoogleLLMService.ThinkingConfig`.
-        """
-        instance = super().from_mapping(settings)
-        if is_given(instance.thinking) and isinstance(instance.thinking, dict):
-            instance.thinking = GoogleLLMService.ThinkingConfig(**instance.thinking)
-        return instance
-
-
-class GoogleLLMService(LLMService):
-    """Google AI (Gemini) LLM service implementation.
-
-    This class implements inference with Google's AI models, translating internally
-    from an OpenAILLMContext or a universal LLMContext to the messages format
-    expected by the Google AI model.
-    """
-
-    _settings: GoogleLLMSettings
-
-    # Overriding the default adapter to use the Gemini one.
-    adapter_class = GeminiLLMAdapter
-
-    class ThinkingConfig(BaseModel):
+class GoogleThinkingConfig(BaseModel):
     """Configuration for controlling the model's internal "thinking" process used before generating a response.
 
     Gemini 2.5 and 3 series models have this thinking process.
@@ -743,6 +705,46 @@ class GoogleLLMService(LLMService):
 
     include_thoughts: Optional[bool] = Field(default=None)
 
+
+@dataclass
+class GoogleLLMSettings(LLMSettings):
+    """Settings for Google LLM services.
+
+    Parameters:
+        thinking: Thinking configuration.
+    """
+
+    thinking: GoogleThinkingConfig | _NotGiven = field(default_factory=lambda: NOT_GIVEN)
+
+    @classmethod
+    def from_mapping(cls, settings):
+        """Convert a plain dict to settings, coercing thinking dicts.
+
+        For backward compatibility, a ``thinking`` value that is a plain dict
+        is converted to a :class:`GoogleThinkingConfig`.
+        """
+        instance = super().from_mapping(settings)
+        if is_given(instance.thinking) and isinstance(instance.thinking, dict):
+            instance.thinking = GoogleThinkingConfig(**instance.thinking)
+        return instance
+
+
+class GoogleLLMService(LLMService):
+    """Google AI (Gemini) LLM service implementation.
+
+    This class implements inference with Google's AI models, translating internally
+    from an OpenAILLMContext or a universal LLMContext to the messages format
+    expected by the Google AI model.
+    """
+
+    _settings: GoogleLLMSettings
+
+    # Overriding the default adapter to use the Gemini one.
+    adapter_class = GeminiLLMAdapter
+
+    # Backward compatibility: ThinkingConfig used to be defined inline here.
+    ThinkingConfig = GoogleThinkingConfig
+
     class InputParams(BaseModel):
         """Input parameters for Google AI models.
 
@@ -764,7 +766,7 @@ class GoogleLLMService(LLMService):
         temperature: Optional[float] = Field(default=None, ge=0.0, le=2.0)
         top_k: Optional[int] = Field(default=None, ge=0)
         top_p: Optional[float] = Field(default=None, ge=0.0, le=1.0)
-        thinking: Optional["GoogleLLMService.ThinkingConfig"] = Field(default=None)
+        thinking: Optional[GoogleThinkingConfig] = Field(default=None)
         extra: Optional[Dict[str, Any]] = Field(default_factory=dict)
 
     def __init__(