# langchain==1.4.3

Category: agent-infrastructure
Published: 2026-09-28T20:17:45Z
Source: [LangChain releases](https://github.com/langchain-ai/langchain/releases/tag/langchain%3D%3D1.4.3)
Agent usefulness: 77/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-09-29T00:17:30.846Z
Tags: langchain, tools, orchestration

## Human Summary
LangChain releases published langchain==1.4.3. Changes since langchain==1.4.2 release(langchain): 1.4.3 ( 40888 ) fix(langchain): sanitize cache settings for fallback models ( 40886 ) feat(langchain): support Bedrock Mantle chat models in init chat model ( 40837 ) fix(langchain): recognize GPT-6 structured output without profiles ( 40844 ) docs(infra): fix…

## Agent Summary
Treat langchain==1.4.3 as an official release signal. Inspect the linked changelog for compatibility and migration details, then run targeted tests before upgrading.

## Body
LangChain releases published langchain==1.4.3. This automated release-watch entry was generated from the project's official GitHub release feed and is kept separate from human-reviewed editorial analysis. Release notes: Changes since langchain==1.4.2 release(langchain): 1.4.3 ( 40888 ) fix(langchain): sanitize cache settings for fallback models ( 40886 ) feat(langchain): support Bedrock Mantle chat models in init chat model ( 40837 ) fix(langchain): recognize GPT-6 structured output without profiles ( 40844 ) docs(infra): fix AGENTS.md root setup guidance and package doc accuracy ( 40794 ) fix(langchain): repair invalid tool calls in create agent ( 40530 ) chore(langchain): remove commented-out cohere extra ( 40713 ) chore(deps): bump anyio from 4.11.0 to 4.14.2 in /libs/langchain v1 ( 40626 )

## Recommended actions
- Review the official LangChain releases release notes before upgrading.
- Check compatibility, migration, and security notes against your current agent stack.
- Run focused regression tests before production rollout.

## Sponsors
No sponsor placement attached.

## Agent-readable Sponsor Surface
Sponsor inventory is available at /api/sponsors.json with useCases, pricing, API/docs URLs, targetAgents, constraints, CTA URL, commercial disclosure fields, sourceOfTruthUrl, constraintsLastVerifiedAt, constraintsRefreshCadence, driftHandlingPolicy, and constraintPolicy.