LangChain
LLM application framework. Releases ship breaking changes often, worth watching.
Release history
langchain-perplexity== 1.4.1
Perplexity integration fixes message type handling, preserves caller parameters, and updates dependencies for compatibility
langchain-openai== 1.6.0
Langchain-openai adds standard model exception types and improves error handling for unexpected OpenAI API response types
langchain-anthropic== 1.6.0
LangChain's Anthropic integration adds standard model exception types and fixes directory search scope issues
langchain-core== 1.6.0
Resolves tool schema serialization issues, adds standard exception types, and improves Windows compatibility in langchain-core
langchain-openai== 1.5.2
Fixes reasoning item boundaries, adds gateway metadata extraction, and extends token counting support to o-series models
langchain-openai== 1.5
Adds gateway metadata extraction from response headers. Fixes o-series token counting
langchain-openrouter== 0.2.8
LangChain OpenRouter now preserves cost metadata and provider information in usage chunks and response metadata
langchain-anthropic== 1.5.6
LangChain Anthropic 1.5.6 fixes tool result block normalization and corrects model profile data for recent Claude versions
langchain== 1.3.15
LangChain 1.3.15 adds state_schema to wrap_tool_call, exposes trace_policy on AgentMiddleware, and fixes middleware control flow, tool call handling, and structured output parsing
langchain-core== 1.5.4
Langchain-core 1.5.4 fixes Pydantic 2.14 compatibility, stops StructuredPrompt from mutating caller kwargs, and preserves tool argument schemas
langchain-openai== 1.4.2
Filters langchain-generated content-block IDs; Handles ContextWindowExceededError
langchain-anthropic== 1.5.4
Langchain-anthropic 1.5.4 fixes tool schema composition handling, preserves tool_choice settings, and adds user_profile_id attribute support
langchain-anthropic== 1.5.2
LangChain Anthropic added Claude Opus 5 model support for AI tooling integrations
langchain-openai== 1.4.1
LangChain OpenAI adds LangSmith gateway support via environment variable and fixes GPT-5.3 profile configuration
langchain-anthropic== 1.5.1
LangChain's Anthropic integration now supports LangSmith gateway via environment variable and enables structured output for Claude Opus 4.8
langchain-anthropic== 1.5.0
Adds reasoning-effort as a standard parameter; Fixes builtin tool recognition
langchain-openai== 1.4.0
Adds reasoning-effort parameter; Bumps Pillow to 12.3.0
langchain-core== 1.5.0
Adds reasoning effort as a standard chat-model parameter
langchain== 1.3.13
LangChain adds Meta model support via new meta extra and implements explicit prompt caching for OpenAI models
langchain-openai== 1.3.4
Suppresses Pydantic serializer warnings on structured output parsed fields and fixes async context loop handling
langchain== 1.3.12
LangChain 1.3.12 fixes interrupt propagation in tool retry middleware, prevents process-group kills in shell operations, and sanitizes Anthropic cache markers on fallback retries
langchain-mistralai== 1.1.6
Surfaces citation metadata from chat responses. Model profile data refreshed
langchain-openrouter== 0.2.6
Adds support for custom HTTP header injection via default headers
langchain== 1.3.11
LangChain 1.3.11 fixes strict tool mode enforcement for non-OpenAI compatible models and updates dependencies
langchain-openai== 1.3.3
Fixes tool schema strictness for OpenAI-compatible models and removes unnecessary response storage fields and stop parameters from API calls
langchain-core== 1.4.8
Langchain-core 1.4.8 memoizes tool schemas, caches JSON schemas, preserves token usage in streaming, and drops Python 3.9 support
langchain-openai== 1.3.1
Fixes streamed tool call normalization and structured output fallbacks, adds package version tracking to tracing metadata
langchain== 1.3.8
Langchain 1.3.8 tightens structured output model fallbacks and fixes async middleware decorator typing
langchain-model-profiles== 0.0.6
Tool call chunk validation added to standard streaming tests, improving LLM integration reliability
langchain-mistralai== 1.1.5
Adds content block token support in callbacks and stabilizes integration tests with rate limiting
langchain-groq== 1.1.3
Langchain-groq 1.1.3 adds content-block-centric streaming v2, strict mode for Groq, standard model properties, and updates dependencies including langsmith 0.8.0 and langchain-core 1.3.3
langchain-openai== 1.3.0
Langchain-openai 1.3.0 adds support for OpenAI's apply_patch built-in tool and updates model profile data
langchain-core== 1.4.2
LangChain Core deprecated the problematic dict() method to encourage use of safer serialization patterns in LLM application chains
langchain-core== 1.4.1
Removes Bedrock prevalidation from load path; Bumps uuid-utils to 0.16.0
langchain-deepseek== 1.1.0
Content-block streaming v2 support, dependency updates including langchain-core 1.3.3, and Azure endpoint handling fixes
langchain== 1.3.4
LangChain 1.3.4 improves human-in-the-loop rejection guidance for better control flow in AI agent workflows
langchain== 1.3.3
LangChain 1.3.3 adds subagent run projection to typed channels and human-in-the-loop interrupt predicates for agentic workflows
langchain-anthropic== 1.4.4
Normalizes cross-provider tool-call IDs in Anthropic integration to ensure consistent behavior across different LLM providers
langchain-fireworks== 1.4.2
Fireworks integration strips non-wire keys from content parts before serialization to prevent serialization errors
langchain-perplexity== 1.3.0
ChatPerplexity now respects responses API flag; No impact unless that parameter is in use
langchain-tests== 1.1.9
Standard test suite relaxes streaming assertion validation to allow extra content blocks in LLM responses
langchain-fireworks== 1.4.0
Migrates to fireworks-ai 1.x SDK. Breaking change for anyone pinning older SDK versions
langchain-tests== 1.1.8
Langchain-tests 1.1.8 constrains langchain-core version bounds and fixes per-call model override behavior in standard tests
langchain== 1.3.0
LangChain agents now support v3 event streaming for improved visibility into agentic execution flows
langchain== 1.2.18
LangChain 1.2.18 reverts agent-type tagging, deprecates hub operations, and retargets create_agent deprecations