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← Back to all updatesPublished ·Anthropic• Minor
Anthropic launched Claude Opus 4.8 with 1M token context by default on Claude API, Bedrock, and Vertex AI.
The read
Default 1M context moves long-context work into the generally available Opus model, not a separate setup.
The frame
It keeps Opus 4.7 tools and platform features, so builders get larger context with the same tool surface.
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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