fix: add 'openrouter' string to OpenAIModel provider param (#1792)

Author: Kludex

pydantic_ai_slim/pydantic_ai/models/__init__.py

@@ -491,7 +491,7 @@ def infer_model(model: Model | KnownModelName | str) -> Model:
         from .cohere import CohereModel
 
         return CohereModel(model_name, provider=provider)
-    elif provider in ('deepseek', 'openai', 'azure'):
+    elif provider in ('deepseek', 'openai', 'azure', 'openrouter'):
         from .openai import OpenAIModel
 
         return OpenAIModel(model_name, provider=provider)

pydantic_ai_slim/pydantic_ai/models/openai.py

@@ -170,7 +170,7 @@ def __init__(
         self,
         model_name: OpenAIModelName,
         *,
-        provider: Literal['openai', 'deepseek', 'azure'] | Provider[AsyncOpenAI] = 'openai',
+        provider: Literal['openai', 'deepseek', 'azure', 'openrouter'] | Provider[AsyncOpenAI] = 'openai',
         system_prompt_role: OpenAISystemPromptRole | None = None,
     ):
         """Initialize an OpenAI model.