npm · #4362

@langchain/core

1.2.9langchain-ai/langchainjs ↗

Core LangChain.js abstractions and schemas

Last release 8 days ago
20 Aug 2026
Ships on a steady schedule
a new release about every 2 weeks
Nearly every release is documented
notes for 59 of the last 60 stable releases
Nothing withdrawn
no release was ever pulled
3 years old
350 releases · first in 2023

Release timeline

350 releases since 2023

202420252026

Releases

0.3.1812 Nov 2024
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0.3.172 Nov 2024
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0.3.1629 Oct 2024
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0.3.1525 Oct 2024
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0.3.1424 Oct 2024
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0.3.1317 Oct 2024
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0.3.1217 Oct 2024
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0.3.1113 Oct 2024
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0.3.1011 Oct 2024
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0.3.10-rc.011 Oct 2024pre-release
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0.3.910 Oct 2024
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0.3.9-rc.110 Oct 2024pre-release
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0.3.9-rc.09 Oct 2024pre-release
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0.3.88 Oct 2024
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0.3.8-rc.08 Oct 2024pre-release
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0.3.73 Oct 2024
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0.3.62 Oct 2024
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0.3.6-rc.02 Oct 2024pre-release
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0.3.530 Sept 2024
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0.3.5-rc.02 Oct 2024pre-release
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0.3.430 Sept 2024
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0.3.319 Sept 2024
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0.3.217 Sept 2024
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0.3.115 Sept 2024
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0.3.013 Sept 2024
Release notes
Minor Changes
- #10924 2e28115 Thanks @christian-bromann! - feat(perplexity): add native completions streamEvents events
Open source →
Additional notes
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
- #10832 1b24369 Thanks @info-arnav! - fix(core, openrouter): make CJS default re-exports callable
- Updated dependencies [3999fab, fce9ab4]:
  - @langchain/[email protected]
Open source →
0.3.0-rc.06 Sept 2024pre-release
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0.2.3610 Oct 2024
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0.2.358 Oct 2024
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0.2.3417 Sept 2024
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0.2.3315 Sept 2024
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0.2.3210 Sept 2024
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0.2.3128 Aug 2024
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0.2.3026 Aug 2024
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0.2.30-rc.026 Aug 2024pre-release
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0.2.2926 Aug 2024
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0.2.2821 Aug 2024
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0.2.2716 Aug 2024
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0.2.2616 Aug 2024
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0.2.2516 Aug 2024
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0.2.2415 Aug 2024
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0.2.2310 Aug 2024
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0.2.229 Aug 2024
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0.2.22-rc.19 Aug 2024pre-release
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0.2.22-rc.08 Aug 2024pre-release
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0.2.216 Aug 2024
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0.2.203 Aug 2024
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0.2.191 Aug 2024
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0.2.1822 Jul 2024
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0.2.18-rc.022 Jul 2024pre-release
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0.2.1718 Jul 2024
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0.2.1616 Jul 2024
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0.2.1510 Jul 2024
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0.2.144 Jul 2024
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0.2.134 Jul 2024
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0.2.13-rc.24 Jul 2024pre-release
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0.2.13-rc.14 Jul 2024pre-release
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0.2.13-rc.03 Jul 2024pre-release
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0.2.122 Jul 2024
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0.2.1128 Jun 2024
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0.2.1025 Jun 2024
Release notes
Patch Changes
- Updated dependencies [c26c87e]:
  - @langchain/[email protected]
Open source →

@langchain/core

Release timeline

Releases

Minor Changes

Minor Changes

Patch Changes

Patch Changes