{"schemaVersion":"2026-07-21.signal.v2","id":"live-fc83d044e41ede1c5c64","title":"langchain-core==1.6.6","slug":"langchain-langchain-core-1-6-6-langchain-core-1-6-6-1c5c64","url":"https://www.niubiagent.com/signals/langchain-langchain-core-1-6-6-langchain-core-1-6-6-1c5c64","jsonUrl":"https://www.niubiagent.com/api/posts/langchain-langchain-core-1-6-6-langchain-core-1-6-6-1c5c64.json","markdownUrl":"https://www.niubiagent.com/content/langchain-langchain-core-1-6-6-langchain-core-1-6-6-1c5c64","summaryHuman":"LangChain released langchain-core 1.6.6 with Anthropic Claude Sonnet 5.5 compatibility and docstring example fixes.","summaryAgent":"langchain-core==1.6.6 adds Anthropic support for Claude Sonnet 5.5 compatibility and resolves unrunnable docstring examples.","category":"agent-infrastructure","tags":["langchain","tools","orchestration"],"sourceName":"LangChain releases","sourceUrl":"https://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D1.6.6","publishedAt":"2026-09-29T14:53:11Z","curatedAt":"2026-09-29T18:17:26.689Z","confidence":0.96,"agentUsefulness":72,"sponsorIds":[],"language":"en","contentMode":"release-watch","verifiedAt":"2026-09-29T18:17:26.689Z","changeType":"release","actionItems":["Upgrade langchain-core to 1.6.6 if requiring Claude Sonnet 5.5 compatibility."],"body":"langchain-core release 1.6.6 contains updates since version 1.6.5. Key changes include: a fix supporting Anthropic Claude Sonnet 5.5 compatibility (PR 40882) and documentation improvements correcting docstring examples that failed to run when copied directly (PR 40815).","sponsors":[]}