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← Back to all updatesPublished ·Anthropic◆ Critical
Claude Code Max plan users now default to fast mode on Claude Opus 4.8.
The read
Default mode changed for Max plan users, so Opus use in Claude Code starts on speed first.
The frame
This sits in Claude Code defaults, so builders on Max should check mode behavior before assuming Opus runs unchanged.
Primary source
Anthropic →Keep reading
See what Nova3 builds →Related updates
- Jun 12, 2026Anthropic publicly documented stop_details on refusal responses, with category and explanation fields for routing.
- Jun 12, 2026Claude Opus 4.8 defaults the effort parameter to high across all surfaces.
- Jun 12, 2026Claude Opus 4.8 lowers prompt caching’s minimum cacheable prompt length to 1,024 tokens versus Opus 4.7.
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