Claude Platform release notes — June 29, 2026
- We've removed fast mode for Claude Opus 4.6. Requests to
claude-opus-4-6withspeed: "fast"no longer run at fast speed or premium pricing: they run at standard speed, are billed at standard rates, and do not return an error. The response'susage.speedfield reports the speed used. To continue using fast mode, migrate to Claude Opus 4.8. Read more in Fast mode.