fast-mode changedbuild-with-claude/fast-mode
Nearest release: v2.1.321, published under an hour before this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
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Recorded edits31to this page, all time
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1717 Claude API: stable
1818 Claude Models on Google Cloud (Anthropic managed): stable
1919 Claude Models on Google Cloud (Google managed): stable
20 Microsoft Foundry (hosted on Azure):
20 Microsoft Foundry:
2121 availability: stable
2222 note: On Microsoft Foundry, fast mode is a separate model whose ID ends in `-fast`. Send requests to a deployment of that model, and leave out `speed`.
2323 details:
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4444Fast mode works only on supported models. See [Availability](https://platform.claude.com/docs/en/build-with-claude/fast-mode#feature-availability) for details, including which models need a beta header.
4545
46On [Claude in Microsoft Foundry](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry), fast mode is a separate model, such as `claude-opus-5-5-fast`. Send fast mode requests to a deployment of the fast model, and leave out `speed`. A request that sets `speed` on a deployment of the model without `-fast` returns an error.
46On [Claude in Microsoft Foundry](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry), fast mode is a separate model, such as `claude-opus-5-5-fast`. For Claude Fable 5.2, it is `claude-fable-5-2-fast`. For Claude Mythos 5.2, it is `claude-mythos-5-2-fast`. Send fast mode requests to a deployment of the fast model, and leave out `speed`. A request that sets `speed` on a deployment of the model without `-fast` returns an error.
4747
4848<CodeGroup>
4949 ```bash cURL
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712712| Status | Cloud platforms | Models |
713713| --------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
714714| Available | Claude API, [Claude Models on Google Cloud (Anthropic managed)](https://platform.claude.com/docs/en/build-with-claude/claude-models-on-google-cloud/anthropic-managed), [Claude Models on Google Cloud (Google managed)](https://platform.claude.com/docs/en/build-with-claude/claude-models-on-google-cloud/google-managed) | [Claude Fable 5.2](https://platform.claude.com/docs/en/models/fable-5-2/overview), [Claude Mythos 5.2](https://platform.claude.com/docs/en/models/mythos-5-2/overview) |
715| Available<sup>1</sup> | [Microsoft Foundry (hosted on Anthropic)](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry) | [Claude Fable 5.2](https://platform.claude.com/docs/en/models/fable-5-2/overview), [Claude Mythos 5.2](https://platform.claude.com/docs/en/models/mythos-5-2/overview) |
715716| Available | Claude API, [Claude Models on Google Cloud (Anthropic managed)](https://platform.claude.com/docs/en/build-with-claude/claude-models-on-google-cloud/anthropic-managed) | [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) |
716717| Available<sup>1</sup> | [Microsoft Foundry (hosted on Azure)](https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry) | [Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/overview) |
717718| Research preview | Claude API | [Claude Opus 5](https://platform.claude.com/docs/en/models/opus-5/overview), [Claude Opus 4.8](https://platform.claude.com/docs/en/models/opus-4-8/overview) |
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