Introducing Claude Opus 4.8

Opus 4.8 is around 4x less likely than its predecessor to allow flaws in code it has written to pass unremarked. It has more honesty about its own progress, and the ability to work independently for longer than its predecessors.

Fast mode is available for Opus 4.8 at roughly 2.5x the speed and is 3x cheaper than before. Turn it on with /fast in Claude Code. On the API, contact your account manager to request access or join the waitlist: http://claude.com/fast-mode

Opus 4.8 defaults to "high" effort. On coding tasks, it spends a similar number of tokens as Opus 4.7’s default, but with better performance. Users can choose “extra” (“xhigh” in Claude Code) or “max,” and the model will spend more tokens to get better results.

Claude Code has a new “dynamic workflows” feature that allows it to tackle very large-scale problems. Claude can plan the work, then run hundreds of parallel subagents in a single session all while verifying output before reporting back.

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