fix(openai): filter out content blocks the chat completions api rejects as input#11175
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🦋 Changeset detectedLatest commit: 5c68d5b The changes in this PR will be included in the next version bump. This PR includes changesets to release 8 packages
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Brace Sproul (bracesproul)
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Jul 9, 2026
Colin Francis (colifran)
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This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated. # Releases ## @langchain/classic@1.0.40 ### Patch Changes - Updated dependencies [[`a9f123a`](a9f123a), [`09e7f6d`](09e7f6d)]: - @langchain/openai@1.5.5 ## @langchain/deepseek@1.1.5 ### Patch Changes - Updated dependencies [[`a9f123a`](a9f123a), [`09e7f6d`](09e7f6d)]: - @langchain/openai@1.5.5 ## @langchain/fireworks@0.2.5 ### Patch Changes - Updated dependencies [[`a9f123a`](a9f123a), [`09e7f6d`](09e7f6d)]: - @langchain/openai@1.5.5 ## @langchain/neo4j@0.1.12 ### Patch Changes - Updated dependencies []: - @langchain/classic@1.0.40 ## @langchain/openai@1.5.5 ### Patch Changes - [#11175](#11175) [`a9f123a`](a9f123a) Thanks [@colifran](https://github.com/colifran)! - fix(openai): filter out content blocks the chat completions api rejects as input - [#11177](#11177) [`09e7f6d`](09e7f6d) Thanks [@colifran](https://github.com/colifran)! - fix(openai): drop tool_call content blocks from chat completions input ## @langchain/openrouter@0.4.5 ### Patch Changes - Updated dependencies [[`a9f123a`](a9f123a), [`09e7f6d`](09e7f6d)]: - @langchain/openai@1.5.5 ## @langchain/together-ai@0.2.5 ### Patch Changes - Updated dependencies [[`a9f123a`](a9f123a), [`09e7f6d`](09e7f6d)]: - @langchain/openai@1.5.5 ## @langchain/xai@1.4.5 ### Patch Changes - Updated dependencies [[`a9f123a`](a9f123a), [`09e7f6d`](09e7f6d)]: - @langchain/openai@1.5.5 Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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Summary
The Chat Completions outbound converter (
convertMessagesToCompletionsMessageParams) forwarded provider reasoning content blocks back into the request history. Strict openai-compatible providers reject them, for example DeepSeek returns400 unknown variant 'reasoning', expected 'text'. Short requests worked, but longer agent runs failed once a reasoning block accumulated in history.The converter already dropped
tool_useblocks. This extends that guard to also dropreasoning,reasoning_content, andthinkingblocks, which are output-only and not valid Chat Completions input content.Reference issue: langchain-ai/openwiki#231
Tests
Unit tests