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beta-headers changedapi/beta-headers

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### Beta features on other platforms

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179179With the SDK, list each feature (for example, `betas=["feature1", "feature2"]` (python; typescript, ruby: `betas: ["feature1", "feature2"]`; php: `betas: ['feature1', 'feature2']`; csharp: `Betas = ["feature1", "feature2"]`; go: `Betas: []anthropic.AnthropicBeta{"feature1", "feature2"}`; java: `.addBeta("feature1").addBeta("feature2")`)). With the CLI, pass a single `--beta` flag with the feature names separated by commas (for example, `--beta feature1,feature2`). You can also repeat the flag (for example, `--beta feature1 --beta feature2`).
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181### Beta features on other platforms
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183Beta names are the same on every platform that accepts them, but not every platform accepts every beta. [Claude Platform on AWS](https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws), [Microsoft Foundry](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry), and [Google Cloud](https://platform.claude.com/docs/en/build-with-claude/claude-on-vertex-ai) take beta names in the `anthropic-beta` header, as the Claude API does. To send several betas, put their names in one header, separated by commas: Google Cloud reads only one `anthropic-beta` header and ignores the rest, so betas in the others don't take effect.
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185On Amazon Bedrock, where beta names go depends on the API you call:
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187* [Claude in Amazon Bedrock](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock) (`bedrock-mantle` endpoints) takes them in the `anthropic-beta` header.
188* The [InvokeModel API](https://platform.claude.com/docs/en/build-with-claude/claude-on-amazon-bedrock-legacy) reads them from the request body, not from a header. List them in the body's `anthropic_beta` array, one name per element, for example `"anthropic_beta": ["feature1", "feature2"]`.
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181190### Endpoint-specific headers
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183192Some beta APIs are scoped to specific endpoints and require a feature-specific beta header on every request:
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