AI Models RadarAnthropic · 22 Sept 2026
Claude Opus 5.5
Anthropic’s latest Opus model for long-running agentic coding and knowledge work, with always-on adaptive thinking.
High-signal launch with broad capability, access or platform-level implications.
Release is backed by the lab’s own announcement or newsroom post.
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Know whether it is ready—and when it is leaving.
Radar tracks the model’s current access stage separately from its original announcement, including official retirement dates and recommended replacements when the lab publishes them.
Available through a public product or API channel.
- Status since
- 22 Sept 2026
Change Lens
What actually changed.
Normalized from the release note so different labs can be compared by the same fields, not just by launch copy.
Stronger long-running agentic coding and knowledge work, always-on adaptive thinking and output more than 30% faster than Opus 5.
Evidence is first-party; comparison labels are normalized by Radar.
Release is backed by the lab’s own announcement or newsroom post.
Verified source · 3 receiptsSource receipts
Evidence behind the brief.
The Radar keeps claims traceable: first-party sources, normalized fields, unknowns and the latest verification marker used for this page.
No unknown normalized fields are currently flagged for this release.
Improves substantially over Opus 5 while reducing standard token prices to $4/$20 and retaining a million-token context window.
This brief links back to the first-party announcement or documentation used by the radar.
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