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Open-source releaseAgents & Tool Use · MLOps, Tooling & Infrastructure · Large Language Models1 source · Sep 28, 2026

langchain-ai/langchain langchain==1.4.3

feat(langchain): support Bedrock Mantle chat models in initchatmodel (#40837)

GPTCohereLangChainAmazon Bedrock
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Key points

  • fix(langchain): sanitize cache settings for fallback models (#40886)
  • fix(langchain): recognize GPT-6 structured output without profiles (#40844)
  • fix(langchain): repair invalid tool calls in createagent (#40530)
  • chore(deps): bump anyio from 4.11.0 to 4.14.2 in /libs/langchainv1 (#40626)

Sources (1)

  • [1]langchain-ai/langchain langchain==1.4.3
    GitHub: langchain-ai/langchain · Sep 28, 08:17 PM
    feat(langchain): support Bedrock Mantle chat models in `init_chat_model` (#40837)
    fix(langchain): sanitize cache settings for fallback models (#40886)

Extractive summary: sentences quoted from the sources.