Files API Goes GA With Per-File Expiration and an `ids[]` List Filter
Claude Platform Release Notes·medium signal
The Files API is GA on the Claude API, dropping the `files-api-2025-04-14` beta header. The GA response format adds file expiration (set `expires_in_seconds` on upload, read `expires_at` on the file object) and `page`/`next_page` pagination with an `ids[]` filter on list. Requests still sending the beta header keep the old format, so this is opt-in by header removal rather than a forced migration.