Announcement1.6.3
langchain-fireworks 1.6.3
Release of langchain-fireworks version 1.6.3 with updates and fixes since the previous release.
fireworksreleaselangchain
LangChain Changelog
LangChain — AI, Developer Tools product updates and releases, tracked on megachangelog.
Announcement1.6.5
langchain-core 1.6.5 Release
Release of langchain-core version 1.6.5 with updates and fixes from the previous 1.6.4 version.
langchain-corereleaseversion-update
Announcement1.6.6
langchain-openai 1.6.6
Release of langchain-openai version 1.6.6 with changes and updates from the previous 1.6.5 version.
langchainopenairelease
Fix1.7.4
langchain-anthropic 1.7.4
Fixed integration test cassette and addressed handling of SystemMessage. These are maintenance updates ensuring test reliability and proper message handling.
anthropicintegrationtestingmessages
Fix1.6.5
langchain-openai 1.6.5
Bug fixes and improvements in the langchain-openai package including fixes related to SystemMessage handling.
openaipythonbug-fixrelease
Announcement1.6.4
langchain-openai 1.6.4
Release of langchain-openai version 1.6.4 with changes since version 1.6.3.
openaireleaselangchain-openai
Announcement1.7.3
langchain-anthropic 1.7.3
Released version 1.7.3 of langchain-anthropic with updates to structured output handling for Fable and Opus 5.5 models, including improvements to SystemMessages support.
anthropicreleasestructured-outputmodels
Fix1.6.2
Fix Fireworks completions model in LLM tests
Updated the Fireworks LLM integration to use the current completions model in LLM tests, ensuring compatibility with the latest model version.
fireworksllmtestingfix
Fix1.1.1
Resolve compatible minimum OpenAI dependencies
Fixed OpenAI dependency compatibility by bumping minimum version requirements for the langchain-deepseek package.
deepseekdependenciesopenaicompatibility
Announcement0.2.9
langchain-openrouter 0.2.9
Release of langchain-openrouter version 0.2.9 with various updates and improvements since version 0.2.8.
openrouterreleaselangchain
Announcement1.6.3
langchain-openai 1.6.3
Patch release for langchain-openai with various bug fixes and improvements since version 1.6.2.
openaireleasepatch
Announcement1.6.4
langchain-core 1.6.4
Release of langchain-core version 1.6.4 with updates and fixes since 1.6.3.
langchain-corereleasepython
Announcement0.0.1a3
langchain-typesafe 0.0.1a3
Initial alpha release of langchain-typesafe, introducing AutoModeMiddleware, ModelRouterMiddleware, and TypeSafeClassifier components for type-safe middleware and routing functionality.
releasetypesafemiddlewarelangchain
Announcement1.4.2
LangChain 1.4.2 Release
LangChain version 1.4.2 is now available with updates since version 1.4.1. This release includes bug fixes and improvements to the LangChain library.
releaselangchainpythonupdates
Announcement0.0.1a2
langchain-typesafe initial release
Initial release of langchain-typesafe with AutoModeMiddleware, ModelRouterMiddleware, and TypeSafeClassifier components for type-safe LangChain integrations.
langchaintypesafemiddlewarerouting
Feature0.0.1a1
langchain-typesafe initial release
Initial release of langchain-typesafe package with TypeSafeClassifier functionality for enhanced type safety in LangChain applications.
langchaintypesafeclassifierrelease
Announcement1.4.1
LangChain 1.4.1
Release 1.4.1 of LangChain includes updates and improvements since the previous 1.4.0 version, featuring InterruptOnConfig documentation enhancements.
langchainreleasedocumentation
Announcement1.6.3
langchain-core 1.6.3
Release of langchain-core version 1.6.3 with bug fixes and improvements including fixes for text access paths and other enhancements.
releasecorelangchain
Announcement1.7.2
langchain-anthropic 1.7.2 release
Release of langchain-anthropic version 1.7.2 with updates since 1.7.1.
anthropicreleaselangchain
Announcement1.6.2
langchain-openai 1.6.2
Release of langchain-openai version 1.6.2 with updates since the previous 1.6.1 version.
langchain-openaireleaseopenaiversion
Fix1.6.1
Bump max_completion_tokens in cache breakpoint integration test
Fixed an issue where max_completion_tokens in the cache breakpoint integration test needed to be increased to accommodate test requirements. This patch release includes various internal fixes and updates to OpenAI integration.
openaitestingcachebugfix
Announcement1.6.2
langchain-core 1.6.2
Patch release of langchain-core with bug fixes and improvements.
langchain-corereleasepatch
Feature1.4.0
langchain 1.4.0 Release
LangChain 1.4.0 introduces new MCP (Model Context Protocol) namespace support with MCPAdapter, includes improved runnable examples in documentation, and updates dependencies including a requirement for version 8.2.0 or higher.
mcprunnablesadapterdocumentation
Announcement1.7.1
langchain-anthropic 1.7.1
Release of langchain-anthropic version 1.7.1 with bug fixes and improvements since 1.7.0.
anthropicreleaselangchain
Announcement1.4.0a4
langchain 1.4.0a4 Release
Initial alpha release of langchain 1.4.0 with extensive new features including Model Context Protocol (MCP) adapter integration, middleware enhancements for agent workflows, and multiple bug fixes and improvements across the codebase.
mcpagentsmiddlewaretoolscore
Feature1.4.0a3
langchain 1.4.0a3 — MCP server integration
Third alpha of 1.4.0 introduces the langchain.mcp namespace for adapting Model Context Protocol servers into LangChain tools. MCPAdapter accepts URLs, local scripts, in-process servers, or pre-built clients and includes tool discovery with optional response caching and human-in-the-loop support via LangGraph interrupts.
mcptoolsintegrationagentscaching
Feature1.4.0a2
langchain.mcp alpha: MCP server adapter for LangChain agents
Introduced langchain.mcp, a first-party adapter that connects any MCP server to LangChain agents via MCPAdapter, supporting multiple servers, flexible authentication, caching, and both legacy and modern protocol versions. Tools are automatically extracted and can be passed directly to create_agent for immediate use.
mcpagentstoolsintegrationalpha
Announcement1.4.0a1
LangChain 1.4.0a1 Initial Release
Initial alpha release of LangChain 1.4.0 with numerous improvements to MCP integration, middleware enhancements, agent creation, and tool handling. Includes fixes for content type conversion, docstrings, and multiple stability improvements across the framework.
mcpmiddlewareagentstoolsframework
Improvement1.6.1
langchain-fireworks 1.6.1
Patch release of langchain-fireworks with bug fixes and improvements since version 1.6.0.
fireworkssdkrelease
Improvement1.6.1
langchain-core 1.6.1
This patch release reverts a prior release and includes fixes and improvements to structured tools, making StructuredTool JSON-serializable.
langchain-coretoolsserialization
Update1.3.18
langchain 1.3.18
Patch release with bug fixes and updates. See pull requests #39894 and #39964 for specific changes.
releasepatchlangchain
Announcement1.7.0
langchain-anthropic 1.7.0
Release of langchain-anthropic version 1.7.0 with updates to thinking display mode, container support, and advisor tool beta header for the latest advisor API version.
anthropicreleaseapitools
Announcement1.3.17
LangChain 1.3.17
Release of LangChain version 1.3.17 with updates and bug fixes since 1.3.16.
releaselangchainlibrary
Announcement1.4.1
langchain-perplexity 1.4.1
Release of langchain-perplexity version 1.4.1 with various bug fixes, improvements, and documentation updates since 1.4.0.
langchain-perplexityreleaseintegration
Announcement1.6.0
langchain-fireworks 1.6.0
Release of langchain-fireworks version 1.6.0 with multiple updates and improvements including service tier support and various bug fixes.
langchain-fireworksreleaseapiservice-tier
Improvement1.3.16
LangChain 1.3.16 Release
Bug fixes and improvements included in the 1.3.16 release. Fixes addressing multiple issues to enhance stability and performance.
releasebugfixstability
Announcement1.6.1
langchain-anthropic 1.6.1
Release of langchain-anthropic version 1.6.1 with changes from the previous 1.6.0 release.
anthropicreleaselangchain
Announcement1.6.0
langchain-openai 1.6.0
Release of langchain-openai version 1.6.0 with updates to chat result creation and OpenAI integration improvements.
openaireleaseintegrationchat
Announcement1.6.0
langchain-anthropic 1.6.0
Release of langchain-anthropic version 1.6.0 with updates and improvements since version 1.5.6.
anthropicreleaselangchain
Feature1.6.0
langchain-core 1.6.0
langchain-core version 1.6.0 includes improvements to StructuredTool with injected args keys, new RunnablePick class, enhanced convert_to_openai_function to handle callables and non-dict mappings, and fixes to Runnable pipe coercion and exception handling.
corerunnabletoolsapi
Announcement1.5.2
langchain-openai 1.5.2
Release of langchain-openai version 1.5.2 with various bug fixes and improvements to OpenAI integration and token counting functionality.
openaireleaseapitokens
Announcement1.5.2a1
langchain-openai 1.5.2a1
Initial alpha release of langchain-openai 1.5.2 containing numerous improvements, bug fixes, and feature additions across OpenAI integration including support for new models, structured output enhancements, token counting improvements, and various stability and performance updates.
openaillmapireleaseintegration
Announcement1.5.6
langchain-core 1.5.6 release
LangChain core library updated to version 1.5.6 with changes from the previous 1.5.5 release.
langchain-corereleasepython
Announcement0.2.8
langchain-openrouter 0.2.8
Release of langchain-openrouter version 0.2.8 with various bug fixes and improvements to the OpenRouter integration for LangChain.
openrouterreleaseintegrationllm
Improvement1.5.5
langchain-core 1.5.5
langchain-core updated to version 1.5.5 with multiple bug fixes and improvements including enhancements to DictPromptTemplate list values handling.
langchain-corereleaseprompt-templates
Announcement1.5.1
langchain-openai 1.5.1 Release
Release of langchain-openai version 1.5.1 with bug fixes and improvements since the previous 1.5.0 version.
openailangchainrelease
Announcement1.5.0
langchain-openai 1.5.0
Release of langchain-openai version 1.5.0 with updates since version 1.4.3.
openaireleaselangchain
Feature1.5.6
langchain-anthropic 1.5.6
Release of langchain-anthropic 1.5.6 with support for tool_search_tool_result blocks, enabling improved tool interaction handling with Anthropic models.
anthropictoolslangchainpython
Fix1.5.5
langchain-anthropic 1.5.5
Released version 1.5.5 of langchain-anthropic with a fix for KeyError that occurred when renaming files in Claude file-tool middleware.
anthropicclaudefile-toolsbugfix
Improvement1.3.15
langchain 1.3.15
Bug fixes and improvements across middleware, tool calling, chat models, and structured responses. Notable changes include trace_policy support on AgentMiddleware, fixes to SummarizationMiddleware and ToolRetryMiddleware, and improved state schema handling in tool wrappers.
middlewareagentstoolschat-modelsimprovements
Announcement1.5.4
langchain-core 1.5.4
Release of langchain-core 1.5.4 containing improvements and bug fixes including enhancements to RootModel runnables and various stability updates.
corerunnablesrelease
Announcement1.4.3
langchain-openai 1.4.3
Release of langchain-openai version 1.4.3 with updates including response header inclusion support and related fixes.
openaireleaseapi
Announcement1.4.2
langchain-openai 1.4.2
Release of langchain-openai version 1.4.2 containing fixes and improvements to OpenAI integration, including handling of context window errors and authorization updates.
openaillmreleaseauth
Improvement1.5.4
langchain-anthropic 1.5.4
This release includes updates to tool_choice handling and adds a user_profile_id convenience attribute for improved integration with Anthropic's API.
anthropiclangchaintoolsapi
Update1.5.3
langchain-core 1.5.3
Patch release with LANGSMITH_API_KEY support for gateway configuration.
langchain-coreapi-keygateway
Announcement1.5.3
langchain-anthropic 1.5.3
Release of langchain-anthropic version 1.5.3 with updates and improvements from the previous 1.5.2 release.
langchainanthropicrelease
Announcement1.5.2
langchain-core 1.5.2
Release of langchain-core version 1.5.2 with updates and fixes since 1.5.1.
langchain-corereleasepython
Announcement1.5.2
langchain-fireworks 1.5.2
Release of langchain-fireworks version 1.5.2 with bug fixes and improvements since version 1.5.1.
releasefireworkslangchain
Announcement1.5.2
langchain-anthropic 1.5.2
Release of langchain-anthropic version 1.5.2 with incremental updates since 1.5.1.
anthropicintegrationrelease
Announcement1.4.1
langchain-openai 1.4.1
Release of langchain-openai version 1.4.1 with improvements to the gpt-5.3-chat-latest profile and related updates from upstream changes.
openaireleasellmintegration
Announcement1.5.1
langchain-fireworks 1.5.1 release
Release of langchain-fireworks version 1.5.1 with incremental changes and fixes.
langchainfireworksrelease
Improvement1.5.1
langchain-core 1.5.1
Release of langchain-core 1.5.1 with improvements to tool call schema caching for BaseTool token counting in the count_tokens_approximately method.
langchain-coreperformancetoken-countingtools
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