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LangChain/LangChain.js

LangChain.js

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Releases172Avg53/moVersions@langchain/anthropic@1.3.27 to langchain@1.4.2
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OpenRouter reasoning content now accessible; CJS exports fixed

↗
@langchain/core@1.1.48
Patch Changes

  • #10832 1b24369 Thanks @info-arnav! - fix(core, openrouter): make CJS default re-exports callable

  • #10666 2bb55b0 Thanks @hnustwjj! - feat(openrouter): surface reasoning content as v1 standard content blocks

    convertOpenRouterResponseToBaseMessage and convertOpenRouterDeltaToBaseMessageChunk now copy OpenRouter's reasoning (flat string) and reasoning_details (structured array) fields onto additional_kwargs.reasoning_content / additional_kwargs.reasoning_details. A new ChatOpenRouterTranslator is registered in @langchain/core under the "openrouter" provider key so AIMessage.contentBlocks emits standard {type: "reasoning"} blocks alongside text and tool calls.

    Previously, reasoning text returned by reasoning-capable models routed through OpenRouter (DeepSeek R1, Minimax M2, Claude extended thinking, o-series, etc.) was silently dropped: only the reasoning_tokens count was preserved via usage_metadata. Consumers using standard content blocks (including the frontend agent UI patterns shown in the docs) could not display the model's chain of thought.

  • #10918 3999fab Thanks @christian-bromann! - fix(openai): stream custom tool calls through Responses API chunks

Reasoning content now emitted as standard content blocks

↗
@langchain/openrouter@0.3.0
Minor Changes

  • #10666 2bb55b0 Thanks @hnustwjj! - feat(openrouter): surface reasoning content as v1 standard content blocks

    convertOpenRouterResponseToBaseMessage and convertOpenRouterDeltaToBaseMessageChunk now copy OpenRouter's reasoning (flat string) and reasoning_details (structured array) fields onto additional_kwargs.reasoning_content / additional_kwargs.reasoning_details. A new ChatOpenRouterTranslator is registered in @langchain/core under the "openrouter" provider key so AIMessage.contentBlocks emits standard {type: "reasoning"} blocks alongside text and tool calls.

    Previously, reasoning text returned by reasoning-capable models routed through OpenRouter (DeepSeek R1, Minimax M2, Claude extended thinking, o-series, etc.) was silently dropped: only the reasoning_tokens count was preserved via usage_metadata. Consumers using standard content blocks (including the frontend agent UI patterns shown in the docs) could not display the model's chain of thought.

Patch Changes

Dependency update

↗
@langchain/neo4j@0.1.6
Patch Changes
  • Updated dependencies []:
    • @langchain/classic@1.0.34

Gemini stream usage metadata restored

↗
@langchain/google-common@2.1.31
Patch Changes

  • #10872 a640079 Thanks @hntrl! - chore(deps): remove redundant @types/uuid declarations

    Remove @types/uuid from package manifests that rely on @langchain/core/utils/uuid or do not require uuid type stubs directly, and refresh the lockfile entries accordingly.

  • #9912 7be1da4 Thanks @yukukotani! - fix missing stream usage metadata on Gemini

UUID v6 utility support added

↗
@langchain/core@1.1.47
Patch Changes

  • #10906 f61b345 Thanks @hntrl! - feat(core): add uuid v6 utility support

    Add v6 UUID generation support to @langchain/core/utils/uuid by vendoring the upstream uuidjs v6 implementation and its v1ToV6 helper, exporting v6 from the UUID utils index, and adding tests for deterministic generation, buffer/offset behavior, validation/versioning, and ordering.

  • #10872 a640079 Thanks @hntrl! - chore(deps): remove redundant @types/uuid declarations

    Remove @types/uuid from package manifests that rely on @langchain/core/utils/uuid or do not require uuid type stubs directly, and refresh the lockfile entries accordingly.

  • #10792 3682268 Thanks @Genmin! - fix(core): apply v1 message casting after implicit streaming aggregation

  • #10901 f26fc4a Thanks @christian-bromann! - fix(testing): share fakeModel invocation state across bindTools instances

Last Checked
2h ago
Latest
@langchain/fireworks@0.1.5
Source
@langchain-ai/langchainjs17.7k
Tracking since Mar 3, 2026
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