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* fix(models): apply stream_chunk_timeout default to all BaseChatOpenAI subclasses The 240s stream_chunk_timeout default (issue #3189, PR #3195) was scoped to a class-path allowlist of only ChatOpenAI and PatchedChatOpenAI. Every other OpenAI-compatible provider that subclasses BaseChatOpenAI — VllmChatModel, MindIEChatModel, PatchedChatDeepSeek, PatchedChatMiMo, PatchedChatStepFun and PatchedChatMiniMax — was excluded, so they kept langchain-openai's aggressive 120s built-in chunk-gap timeout and, worse, silently discarded a user's explicit stream_chunk_timeout override from config.yaml. Issue #3189 was itself reported on mimo-v2.5 (PatchedChatMiMo), the exact class the original fix left out. Gate the injection on issubclass(model_class, BaseChatOpenAI) instead of the string allowlist, so any OpenAI-compatible subclass inherits the default and honors an explicit override. Genuinely non-OpenAI clients (e.g. ChatAnthropic) stay excluded and still have the kwarg dropped before it reaches a constructor that would divert it into model_kwargs and fail at request time. * fix(models): address review nits on stream_chunk_timeout default Correct the module-level comment above _DEFAULT_STREAM_CHUNK_TIMEOUT_SECONDS: langchain-openai's built-in stream_chunk_timeout default is 120s, not 60s (BaseChatOpenAI.stream_chunk_timeout's default_factory reads LANGCHAIN_OPENAI_STREAM_CHUNK_TIMEOUT_S with a 120.0 fallback). Simplify the BaseChatOpenAI gate in _apply_stream_chunk_timeout_default from `isinstance(model_class, type) and issubclass(model_class, BaseChatOpenAI)` to just `issubclass(...)`. The sole caller passes model_class from resolve_class(), which already raises before returning anything that isn't a type, so the isinstance half can never be False there. Also soften the docstring's non-OpenAI-client bullet: ChatAnthropic declares extra="ignore" and silently drops an unrecognized kwarg rather than diverting it into model_kwargs and failing at request time (that failure mode is specific to other OpenAI-style clients).