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← Back to all updatesPublished ·Anthropic• Minor
Claude Opus 4.8 defaults the effort parameter to high across all surfaces.
The read
Default effort changed across surfaces, so Claude Code and Messages API usage now starts from high effort.
The frame
This sits at the parameter layer, making Claude Code and Messages API behavior consistent on high effort by default.
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 lowers prompt caching’s minimum cacheable prompt length to 1,024 tokens versus Opus 4.7.
- Jun 12, 2026Claude Opus 4.8 with adaptive thinking triggers reasoning only when a turn needs it.
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