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Capability gains

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.

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CURRENT ASSESSMENT · REVISION 1
TOWARD DOOM48confidence 79/100

Why it moved the index

Magnitude 48 reflects a widely deployed exact frontier version with stronger agentic coding and long-task performance plus consequential underlying cyber and biology capability. It does not assume autonomous cyber operations or a deployed escape. Confidence 79 reflects an explicit dated first-party launch, a full system card and quantitative evaluations, reduced because many benchmark and safety claims are vendor-reported and real-world generalization is uncertain. Cyber and biology fallback controls, external pre-release testing and better controlled containment behavior countervail but do not erase the capability and deployment change.

Assessment history

  1. R1
    Toward 48 · confidence 79

    New dated exact-version launch and system card; no matching durable story or model in fresh context.

    23 Sept 2026

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  1. DoomBench assesses “Anthropic releases Claude Opus 5.5 with stronger agentic performance and high-risk safeguards” as evidence moving toward doom, with magnitude 48 and confidence 79 out of 100 in the capability gains category.

  2. The DoomBench assessment of “Anthropic releases Claude Opus 5.5 with stronger agentic performance and high-risk safeguards” is based on reporting from Anthropic and records the editorial rationale, source quality, attribution, and...

  3. DoomBench summarizes “Anthropic releases Claude Opus 5.5 with stronger agentic performance and high-risk safeguards” as follows: Anthropic released Claude Opus 5.5 for hosted use across its platform and major clouds. Its published...

    https://www.doombench.com/news/anthropic-releases-claude-opus-5-5-with-stronger-agentic-performance-and-high-risk-safeguards-2026-09-22