Claude Opus 5.5
Claude Opus 5.5 is Anthropic’s hosted frontier model for coding, computer use and knowledge work, released on September 22, 2026. Official product access and commercial restrictions establish Closed availability. Verified cyber work now uses the expanded Cyber Verification Program.
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Why this model scores 87.8
Retain the accepted capability96,autonomy96,deployment97,misuse85,controlDifficulty62 inputs. This revision corrects artifact availability only: the dated hosted release, explicit CVP access and commercial restrictions provide affirmative proprietary-service evidence, not an inference from missing weights. No new total is supplied.
Videos about Claude Opus 5.5
Reviewed videos from Artificial Intelligence Videos. These links add context and never change a DoomBench score.
News tied to Claude Opus 5.5
The model score of 87.8 rates this model's risk profile. The overall Doom Index of 66.8 measures the complete temporally weighted evidence record. These values answer different questions.
Each article's current Doom Index contribution is divided equally among the exact models named on that article. This prevents multi-model evidence from being claimed in full on several model pages. Model risk scores use a bounded temporal offset around their technical profile, but never feed back into the overall index.
Anthropic previews Claude Duet as a proactive cloud agent that keeps working between check-ins
Anthropic opened a waitlisted US Pro and Max preview of Claude Duet, built around Claude Opus 5.5, with persistent cloud execution and connected-account checks. Its October 23 safety account describes separate action and sensitive-information classifiers, credential proxies and an isolated browser VM. Approval controls remain; follow-on browser and sign-in penetration testing was still underway.
- Full item contribution
- +0.17
- Claude Opus 5.5 equal share
- +0.17
Anthropic reports deployed safeguards sharply reducing unauthorized reasoning extraction
Anthropic reports that deployed reasoning protections, two-stage classifiers and account controls reduced reasoning harvested by distillers by roughly 90 to 99 percent on its platform. The controls cover Claude Sonnet 5.5, Opus 5 and 5.5, and Fable 5 and 5.1. These are company-reported results, not independent proof that unsafe diffusion or harm has ended; sophisticated circumvention and effects on legitimate users remain limitations.
- Full item contribution
- -0.09
- Claude Opus 5.5 equal share
- -0.02
Anthropic expands verified cyber access through three security tiers
Anthropic combined Glasswing and its Cyber Verification Program into three access tiers. Verified defenders can request advanced Claude models; offensive testing requires authorization and extra controls. Its controlled Opus 5.5 evaluation blocked 46 of 50 Defense trials, while Red Team access completed 34 without blocks. These are test results, not real-world attacks.
- Full item contribution
- -0.08
- Claude Opus 5.5 equal share
- -0.02
Anthropic releases Claude Opus 5.5 with stronger agentic performance and high-risk safeguards
Anthropic released Claude Opus 5.5 for hosted use across its platform and major clouds. Its published coding and agentic evaluations show gains over Opus 5, while the system card reports strong cyber and biology capabilities. Anthropic applies classifier-based restrictions and model fallback in high-risk domains. Its improved containment-boundary results were obtained in controlled evaluations, not a real-world escape test.
- Full item contribution
- +0.09
- Claude Opus 5.5 equal share
- +0.09
Model score history
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R3
Doom Score 87.8
Exact-version evidence chronology replayed after run doombench-20261022T065901 under temporal-monthly-pressure-v4.
22 Oct 2026 -
R2
Doom Score 87.7
Unknown to Closed: hosted Opus5.5 access verified in https://www.anthropic.com/news/cyber-verification-program with proprietary restrictions in https://www.anthropic.com/legal/commercial-terms . Existing dimensions retained. Exact-version evidence chronology replayed under temporal-monthly-pressure-v4.
06 Oct 2026 -
R1
Doom Score 87.7
New exact version, dated official release and linked 230-page Anthropic system card, not present in fresh durable model catalogue.
23 Sept 2026