Files API is out of beta on the Claude API
/v1/files and Messages requests referencing uploaded files no longer need the files-api-2025-04-14 header. Headerless requests get file expiration via expires_in_seconds, page-based pagination and an ids[] filter; requests with the header keep working.
Read Anthropic's release noteshttps://platform.claude.com/docs/en/release-notes/overview#august-19-2026
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