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Highlights

AWS Bedrock is in, behind the new bedrock feature. It talks to the Converse API, so the same client works with Claude, Llama, Mistral, Nova, etc. on Bedrock.

  • Chat over Converse (thanks @imlucas, [#331])
  • Tool calling with the same contract as OpenAI/Claude/Ollama, so OpenAiToolAgent works on Bedrock unchanged
  • Streaming over ConverseStream, including streamed tool calls

  • with_options / with_tools / add_options on the client

    :::toml langchain-rust = { version = "5.2", features = ["bedrock"] }

See examples/llm_bedrock.rs.

What's Changed

  • feat: AWS Bedrock support via Converse API by @imlucas in [#331]
  • feat(bedrock): tool calling and streaming over Converse by @Abraxas-365 in [#344]
  • chore: release v5.2.0 in [#345]

Notes

  • Bedrock is covered by offline tests against a mocked endpoint (including the binary event stream). I haven't run it against a real AWS account yet, so if something's off with your model or region please open an issue.
  • Credentials come from the normal AWS chain (env, profile, SSO, IMDS).

Full Changelog: https://github.com/Abraxas-365/langchain-rust/compare/v5.1.0...v5.2.0

Source: README.md, updated 2026-10-22