We've removed fast mode for Claude Opus 4.6. Requests to claude-opus-4-6 with speed: "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's usage.speed field reports the speed used. To continue using fast mode, migrate to Claude Opus 4.8.
Fetched July 2, 2026
Claude Opus 4.8 fast mode is rolling out in preview on GitHub Copilot, offering significantly faster output token speeds at reduced cost wh…
GitHub · GitHub ChangelogOpus 4.6 (fast) will be deprecated across all GitHub Copilot experiences on June 29th, 2026. The suggested alternative is Opus 4.8 (fast);…
GitHub · GitHub ChangelogFast mode for Claude Opus 4.7 deprecated, with removal on July 24, 2026. After removal, requests to with will return an error. Migrate to f…
Anthropic · Claude PlatformRate limits raised across the Claude API. Claude Sonnet and Claude Haiku rate limits now match Claude Opus at every usage tier. Usage tiers…
Anthropic · Claude Platform