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← Back to all updatesPublished ·Anthropic• Minor
Anthropic retired the 1M context beta for Claude Sonnet 4.5 and Claude Sonnet 4.
The read
Old Sonnet long-context calls now error past 200k tokens unless moved to Sonnet 4.6 or Opus 4.6.
The frame
The 1M window moved from beta header on older Sonnet models to generally available access on Sonnet 4.6 and Opus 4.6.
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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