For Amazon Bedrock support changedcli-sdks-libraries/sdks/python
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526526## Default headers
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528The SDK automatically sends the `anthropic-version` header set to `2023-06-01`.
528The SDK automatically sends the `anthropic-version` header set to the API version for this major version of the SDK (see [Semantic versioning](https://platform.claude.com/docs/en/cli-sdks-libraries/sdks/python#semantic-versioning)).
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530530If you need to, you can override it by setting default headers on the client object or per-request.
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758758Use `AnthropicBedrockMantle` for new projects; `AnthropicBedrock` remains for existing applications using the Bedrock `InvokeModel` API.
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760760## Semantic versioning
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762Each major version of this SDK sends one API version in the `anthropic-version` header by default, and a new major version comes with each new API version. The first major version that sends `2026-10-21` is 2.0.0; see [Migrating to API version 2026-10-21](https://platform.claude.com/docs/en/api/migration-2026-10-21#upgrade).
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762764This package generally follows [SemVer](https://semver.org/spec/v2.0.0.html) conventions, though certain backward-incompatible changes may be released as minor versions:
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