LangChain releases
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LangChain releases dev-tools 1d ago
langchain==1.4.0a2
Alpha preview of langchain.mcp — a first-party adapter that turns any MCP server into LangChain tools you can hand straight to create_agent . Connection handling is FastMCP 's, so its client features are available as-is rather than re-implemented behind a narrower interface. pip…
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langchain==1.4.0a1
Initial release fix(langchain): name the content type MCP conversion could not handle release(langchain): 1.4.0a1 test(langchain): skip MCP tests on a pydantic older than mcp supports test(langchain): drive MCP tests through FastMCP's own utilities fix(langchain/mcp): review…
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langchain-core==1.6.1
Changes since langchain-core==1.6.0 revert: release(core): 1.6.2 ( #39971 ) release(core): 1.6.2 ( #39967 ) fix(core): shore up indexing in genai v1 streaming content ( #39964 ) fix(core): make StructuredTool JSON-serializable ( #39631 ) chore(deps): bump minor and patch…
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langchain-anthropic==1.7.0
Changes since langchain-anthropic==1.6.1 release(anthropic): 1.7.0 ( #39963 ) feat(anthropic): support top-level param for skills via container ; updates thinking display mode ( #39962 ) feat(anthropic): support 1.0 sdk ( #39938 ) fix(anthropic): auto-append…
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langchain-perplexity==1.4.1
Changes since langchain-perplexity==1.4.0 release(perplexity): 1.4.1 ( #39826 ) fix(perplexity): include type="message" on Responses input items ( #39774 ) fix(perplexity): preserve caller extra_body ( #39203 ) chore: bump pillow from 12.2.0 to 12.3.0 in…
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langchain-fireworks==1.6.0
Changes since langchain-fireworks==1.5.2 release(fireworks): 1.6.0 ( #39810 ) feat(fireworks): add document reranking ( #39732 ) fix(fireworks): filter invalid tool calls from v1 content ( #39805 ) feat(core): add standard model exception types ( #39538 ) chore(model-profiles):…
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langchain==1.3.16
Changes since langchain==1.3.15 release(langchain): 1.3.16 ( #39806 ) feat(core): add standard model exception types ( #39538 ) feat(langchain): support custom token_counter in ContextEditingMiddleware ( #39754 ) fix(langchain): re-raise non-retryable exceptions in…
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langchain-anthropic==1.6.0
Changes since langchain-anthropic==1.5.6 release(anthropic): 1.6.0 ( #39763 ) feat(core): add standard model exception types ( #39538 ) fix(anthropic): exclude sibling directories from grep search scope ( #39681 ) chore(infra): support langsmith gateway in CI ( #39651 )
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langchain-core==1.6.0
Changes since langchain-core==1.5.6 release(core): 1.6.0 ( #39760 ) fix(core): resolve postponed annotations in StructuredTool._injected_args_keys ( #39602 ) feat(core): add standard model exception types ( #39538 ) fix(core): allow deserializing RunnablePick ( #39753 )…
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langchain-openai==1.5.2
Changes since langchain-openai==1.5.1 release(openai): 1.5.2 ( #39719 ) fix(openai): preserve reasoning item boundaries ( #39278 ) release(openai): 1.5.2a1 ( #39709 ) feat(openai): extract gateway metadata from response headers when available ( #39706 ) chore(openai): update…
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langchain-openai==1.5.2a1
Initial release release(openai): 1.5.2a1 ( #39709 ) feat(openai): extract gateway metadata from response headers when available ( #39706 ) chore(openai): update snapshots ( #39657 ) fix(openai): support o-series models in get_num_tokens_from_messages ( #38710 ) release(openai):…
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langchain-core==1.5.6
Changes since langchain-core==1.5.5 chore(core): release 1.5.6 ( #39704 ) feat(core): incorporate gateway metadata to traces ( #39703 )
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langchain-openrouter==0.2.8
Changes since langchain-openrouter==0.2.7 release(openrouter): 0.2.8 ( #39658 ) chore(model-profiles): refresh model profile data ( #39646 ) chore(model-profiles): refresh model profile data ( #39625 ) fix(openrouter): preserve cost metadata in usage chunks ( #39338 )…
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langchain-core==1.5.5
Changes since langchain-core==1.5.4 release(core): 1.5.5 ( #39655 ) fix(core): make abatch_iterate consistent with batch_iterate for None and zero size ( #39367 ) fix(core): respect pydantic aliases when validating tool inputs ( #39572 ) fix(core): issues in merging chunks (…
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langchain-anthropic==1.5.5
Changes since langchain-anthropic==1.5.4 release(anthropic): 1.5.5 ( #39597 ) fix(anthropic): report reasoning tokens in usage metadata ( #39590 ) fix(anthropic): fix KeyError on rename in Claude file-tool middleware ( #39293 ) chore(model-profiles): refresh model profile data (…
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langchain==1.3.15
Changes since langchain==1.3.14 release(langchain): 1.3.15 ( #39595 ) feat(langchain): expose trace_policy on AgentMiddleware ( #38910 ) chore(langchain): fix type errors in tests ( #39589 ) chore: bump h2 from 4.3.0 to 4.4.1 in /libs/langchain_v1 ( #39324 ) fix(langchain):…
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langchain-core==1.5.4
Changes since langchain-core==1.5.3 release(core): 1.5.4 ( #39592 ) fix(core): compat with pydantic 2.14 ( #39328 ) fix(core): stop StructuredPrompt from mutating caller kwargs ( #39174 ) fix(core): preserve flat tool args schema for RootModel runnables ( #39307 ) fix(core):…
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langchain-openai==1.4.3
Changes since langchain-openai==1.4.2 release(openai): 1.4.3 ( #39485 ) fix(openai): filter invalid tool calls from content ( #39366 ) chore(openai): update guidance for responses API for OpenAI-compatible providers ( #39327 ) chore(openai): update docstring for…
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langchain-openai==1.4.2
Changes since langchain-openai==1.4.1 release(openai): 1.4.2 ( #39322 ) fix(openai): handle ContextWindowExceededError ( #39300 ) chore: bump the minor-and-patch group across 3 directories with 7 updates ( #39187 ) fix(openai): filter langchain-generated content block IDs (…
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langchain-anthropic==1.5.4
Changes since langchain-anthropic==1.5.3 release(anthropic): 1.5.4 ( #39277 ) fix(anthropic): handle tool schemas with unsupported top-level composition ( #39273 ) chore: bump the minor-and-patch group across 3 directories with 7 updates ( #39187 ) fix(anthropic): preserve…
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langchain-core==1.5.3
Changes since langchain-core==1.5.2 release(core): 1.5.3 ( #39145 ) fix(core): fall back to LANGSMITH_API_KEY for gateway ( #39115 )
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langchain-anthropic==1.5.3
Changes since langchain-anthropic==1.5.2 release(anthropic): 1.5.3 ( #39109 ) fix(anthropic): preserve empty thinking field in signature_delta streaming ( #38765 ) fix(anthropic): strip unsupported fields from system message content blocks ( #39101 )
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langchain-core==1.5.2
Changes since langchain-core==1.5.1 release(core): 1.5.2 ( #39108 ) fix(core): handle empty string in gateway env vars ( #39107 ) chore: bump setuptools from 82.0.0 to 83.0.0 in /libs/core ( #39032 ) chore: bump jupyterlab from 4.5.9 to 4.5.10 in /libs/core ( #39033 ) chore:…
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langchain-fireworks==1.5.2
Changes since langchain-fireworks==1.5.1 release(fireworks): 1.5.2 ( #39093 ) chore(model-profiles): refresh model profile data ( #39092 ) chore(model-profiles): refresh model profile data ( #39084 ) chore(model-profiles): refresh model profile data ( #39050 )
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langchain-anthropic==1.5.2
Changes since langchain-anthropic==1.5.1 release(anthropic): 1.5.2 ( #39056 ) feat(anthropic): add Claude Opus 5 support ( #39054 )
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langchain-anthropic==1.5.1
Changes since langchain-anthropic==1.5.0 release(anthropic): 1.5.1 ( #39043 ) feat(anthropic,fireworks,openai): support langsmith gateway through env var ( #38742 ) fix(anthropic): enable structured output for Claude Opus 4.8 ( #39021 )
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langchain-core==1.5.1
Changes since langchain-core==1.5.0 release(core): 1.5.1 ( #39042 ) feat(anthropic,fireworks,openai): support langsmith gateway through env var ( #38742 ) fix(core): use tool_call_schema cache for BaseTool token counting in count_tokens_approximately ( #39020 )
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langchain-openrouter==0.2.7
Changes since langchain-openrouter==0.2.6 release(openrouter): 0.2.7 ( #39022 ) chore(model-profiles): refresh model profile data ( #39010 ) chore(model-profiles): refresh model profile data ( #38990 ) chore(model-profiles): refresh model profile data ( #38927 )…
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langchain-anthropic==1.5.0
Changes since langchain-anthropic==1.4.8 release(anthropic): 1.5.0 ( #38985 ) feat(core): add reasoning_effort as a standard chat model parameter ( #38887 ) fix(anthropic): add advisor_ prefix to builtin tool recognition ( #38686 ) chore(deps): refresh lockfiles ( #38746 )…
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langchain-fireworks==1.5.0
Changes since langchain-fireworks==1.4.4 release(fireworks): 1.5.0 ( #38986 ) feat(core): add reasoning_effort as a standard chat model parameter ( #38887 ) chore: bump langsmith from 0.10.2 to 0.10.6 in /libs/partners/fireworks ( #38914 ) fix: patch Dependabot dependency…
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langchain-xai==1.3.0
Changes since langchain-xai==1.2.2 release(xai): 1.3.0 ( #38984 ) feat(core): add reasoning_effort as a standard chat model parameter ( #38887 ) fix: patch Dependabot dependency vulnerabilities ( #38853 ) chore: bump langsmith from 0.9.5 to 0.10.2 in /libs/partners/xai ( #38832…
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langchain-openai==1.4.0
Changes since langchain-openai==1.3.5 release(openai): 1.4.0 ( #38983 ) chore: bump pillow from 12.2.0 to 12.3.0 in /libs/partners/openai ( #38999 ) feat(core): add reasoning_effort as a standard chat model parameter ( #38887 ) chore(model-profiles): refresh model profile data (…
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langchain-core==1.5.0
Changes since langchain-core==1.4.9 release(core): 1.5.0 ( #38978 ) feat(core): add reasoning_effort as a standard chat model parameter ( #38887 ) chore: bump soupsieve from 2.8 to 2.8.4 in /libs/core ( #38750 ) chore: bump mistune from 3.2.1 to 3.3.0 in /libs/core ( #38783 )
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langchain==1.3.13
Changes since langchain==1.3.12 release(langchain): 1.3.13 ( #38787 ) feat(langchain): add meta extra and support langchain-meta in init_chat_model ( #38786 ) feat(openai): support explicit prompt caching ( #38762 ) chore(deps): refresh lockfiles ( #38746 )
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langchain-fireworks==1.4.4
Changes since langchain-fireworks==1.4.3 release(fireworks): 1.4.4 ( #38753 ) fix(fireworks): report cached prompt token usage ( #38751 ) chore(deps): refresh lockfiles ( #38746 ) chore(model-profiles): refresh model profile data ( #38663 ) chore: bump pytest from 9.1.0 to 9.1.1…
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langchain-openai==1.3.4
Changes since langchain-openai==1.3.3 release(openai): 1.3.4 ( #38731 ) fix(openai): suppress Pydantic serializer warning on structured output parsed field ( #37727 ) test(openai): skip Codex VCR tests before cassette setup ( #38690 ) chore: bump the minor-and-patch group across…
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langchain==1.3.12
Changes since langchain==1.3.11 release(langchain): 1.3.12 ( #38730 ) fix(langchain): propagate interrupts through ToolRetryMiddleware ( #38722 ) fix(langchain): avoid shared process-group kill in shell middleware ( #36359 ) fix(langchain): sanitize anthropic cache markers on…
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langchain-core==1.4.9
Changes since langchain-core==1.4.8 release(core): 1.4.9 ( #38728 ) fix(core): improve langsmith loader error messages ( #35648 ) fix(core): output parser bugs in xml.py and pydantic.py ( #35641 ) style(core): fix some ruff preview rules ( #38656 ) fix(core): avoid dict…
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