Claude · releasedAPI version 2026-10-21

validasserted

Valid from: 2026-10-21
Valid until: still holds
Published: 2026-10-21
Recorded by AsOf: 2026-10-31
Checked: 2026-10-31 · its source page states the value and the date
Confidence: 0.70

Sources

“October 21, 2026 We’ve released API version 2026-10-21 . Migrating to API version 2026-10-21 shows how to upgrade.”— what the page says, read 2026-10-31

Claude Platform release notes, October 21, 2026primary · platform.claude.com · 2026-10-21

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