langchain-openai==1.2.1

LangChain Releases / 4/25/2026

📰 NewsDeveloper Stack & InfrastructureTools & Practical UsageModels & Research

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Key Points

The langchain-openai package was updated from version 1.2.0 to 1.2.1 with a hotfix that bumps the minimum required core dependency versions.
The release includes an OpenAI-specific fix to add “gpt-5.5 pro” to the Responses API availability check.
A new core feature adds content-block-centric streaming (v2), improving how streamed outputs are structured and handled.
The update also refreshes model profile data via a chore/model-profiles change to keep model metadata current.

Changes since langchain-openai==1.2.0

hotfix: bump min core versions (#36996)
release(openai): 1.2.1 (#36995)
fix(openai): add gpt-5.5 pro to Responses API check (#36994)
feat(core): add content-block-centric streaming (v2) (#36834)
chore(model-profiles): refresh model profile data (#36982)