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blogmodel-release

Claude Opus 5.5 fast mode: GA without waitlist

At a glance

Anthropic took Opus 5.5 fast mode out of research preview: set `speed: "fast"` (no beta header) for up to 2.5× OTPS at $8/$40 per MTok; separate rate limits; Claude Code `/fast` for interactive loops. This workflow is listed under model-release, latency, claude, api, coding-agents.

Agents / tools
Claude Opus 5.5, Claude API, Claude Code, Microsoft Foundry

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Prompt excerpt

Fast mode for Claude Opus 5.5 doesn't need the fast-mode-2026-02-01 beta header or an access request.

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