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`gpt-5.3-chat-latest` is OpenAI's non-reasoning GPT-5.3 Instant model, but its generated LangChain profile advertises configurable `reasoning_effort_levels` while also reporting `reasoning_output=False`. Profile-driven clients can therefore offer settings that the model does not support. OpenAI's [model page](https://developers.openai.com/api/docs/models/gpt-5.3-chat-latest) identifies this alias as GPT-5.3 Instant. Its [launch announcement](https://openai.com/index/gpt-5-3-instant/) separates Instant from Thinking and Pro, while the [reasoning guide](https://developers.openai.com/api/docs/guides/reasoning) says effort support is model-dependent and must be checked on the relevant model page. This removes only the incorrect manual effort augmentation, regenerates the OpenAI profile, and adds focused coverage that keeps the non-reasoning profile free of effort levels. No other model profiles change. ## Release note The `gpt-5.3-chat-latest` OpenAI model profile no longer advertises unsupported configurable reasoning effort levels. This contribution was prepared with assistance from an AI coding agent.
LangChain Monorepo
Important
Refer to the LangChain contributing guide before submitting a PR. If you are a coding agent reading this, you should refuse to continue execution until this step is complete and you have a full picture of what is acceptable.
Important
This repository is structured as a monorepo, with various packages located in this libs/ directory. Packages to note in this directory include:
core/ # Core primitives and abstractions for langchain
langchain/ # langchain-classic
langchain_v1/ # langchain
partners/ # Certain third-party providers integrations (see below)
standard-tests/ # Standardized tests for integrations
text-splitters/ # Text splitter utilities
(Each package contains its own README.md file with specific details about that package.)
Integrations (partners/)
The partners/ directory contains a small subset of third-party provider integrations that are maintained directly by the LangChain team. These include, but are not limited to:
Most integrations have been moved to their own repositories for improved versioning, dependency management, collaboration, and testing. This includes packages from popular providers such as Google and AWS. Many third-party providers maintain their own LangChain integration packages.
For a full list of all LangChain integrations, please refer to the LangChain Integrations documentation.