LangChain-OpenAI version 1.4.1 is a minor release that builds on the previous 1.4.0 with a couple of practical improvements. It focuses on better integration with LangSmith’s infrastructure and correcting a model configuration quirk.
A notable new feature is the ability to route API calls through LangSmith’s gateway by simply setting an environment variable. This makes it effortless for self-hosted users to add observability, monitoring, and control to their OpenAI requests without extra code changes, aligning with similar support in the Anthropic and Fireworks integrations.
On the fix side, the internal profile for the experimental gpt-5.3-chat-latest model was improperly configured, which could lead to unexpected behavior. That has now been corrected, so developers can rely on consistent behavior when using that model variant.
