Claude Opus 5.5 fast mode exits preview: 2.5x faster at $8/$40 per million tokens
ClaudeDevs · x · 2026-10-16
Anthropic announced that fast mode on the Claude Platform is out of research preview, with the waitlist removed.
- Supported models: Claude Opus 5.5, Opus 5, and Opus 4.8 — same model weights with a faster inference config; up to 2.5x higher output tokens per second (OTPS), no improvement in time to first token.
- Pricing: $8/$40 per million tokens (input/output) for Opus 5.5; $10/$50 for Opus 5 and 4.8. Stacks with prompt caching and data residency multipliers.
- Availability: Live on Microsoft Foundry (hosted on Azure), Google Cloud coming soon. Fast mode in Claude Code is unchanged and uses extra usage credits.
- Enabled via speed: "fast"; preview-stage models require the fast-mode beta header.
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