Claude’s first-party Messages and Token Counting APIs accept 128 MB requests, up from 32 MB, per October 28 release notes. Image-heavy prompts get more room; other endpoints and cloud platforms keep separate limits.

Official Claude API request-size table captured October 29, 2026: Messages and Token Counting 128 MB, Batches 256 MB, Files 500 MB, and Sessions, Agents and Environments 32 MB; cloud-platform exceptions are shown below.

Published 29 Oct 2026 · 22:33 UTC

Anthropic Claude Platform release notes ↗ · Source dated 28 Oct 2026

Claude’s first-party Messages and Token Counting APIs accept 128 MB requests, up from 32 MB, per October 28 release notes. Image-heavy prompts get more room; other endpoints and cloud platforms keep separate limits. · ournews.ai