Claude Opus gets a 2.5x faster "fast mode
By Steven Van ·
The research preview is live for Claude Code users with extra usage, while API access needs an account manager or waitlist signup.
Fast mode is a high-speed configuration of Claude Opus 5 that runs output tokens about 2.5x faster while keeping the same Opus-level intelligence. It's rolling out as a limited research preview: developers using Claude Code with extra usage enabled can use it now, and access on the Claude Platform (API) requires reaching out to an account manager or joining a waitlist for those without one.
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