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reasoning_effort parameter added; builtin tool recognition fixed

langchain-anthropic==1.5.0

1 feature2 fixesThis release1 featureNew capabilities2 fixesBug fixesAI-tallied from the release notes
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Changes since langchain-anthropic==1.4.8

release(anthropic): 1.5.0 (#38985) feat(core): add reasoning_effort as a standard chat model parameter (#38887) fix(anthropic): add advisor_ prefix to builtin tool recognition (#38686) chore(deps): refresh lockfiles (#38746) chore(model-profiles): refresh model profile data (#38689) chore(model-profiles): refresh model profile data (#38663) chore: bump the minor-and-patch group across 3 directories with 11 updates (#38587) chore(anthropic): update docstring following sonnet-5 release (#38577) fix(anthropic): ignore LangSmith requests in VCR cassettes (#38547)

Fetched July 21, 2026