Create a Message Batch changedapi/beta/messages/batches/create
Nearest release: v2.1.301, published 11 hours 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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First seen
14 Aug 2026
this site's first read of the page
Recorded edits26to this page, all time
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39713971 The inference speed mode for this request. `"fast"` enables high output-tokens-per-second inference.
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3973 Some models require the `fast-mode-2026-02-01` beta header for any `speed` value. See [fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode?sdk_languages=http) for which models.
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39733975 - `"standard"`
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39753977 - `"fast"`
No line in this hunk matches that.