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Anthropic releases Claude Sonnet 5.5 with faster agentic coding and cyber safeguards

Anthropic released Claude Sonnet 5.5 for hosted products and APIs, reporting major gains in coding, computer use and long-horizon work with faster, lower-cost operation than Sonnet 5. The release adds cyber fallbacks, containment evaluations, biology controls and anti-distillation classifiers; benchmark and early-customer results do not prove reliability on unsupervised consequential tasks.

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CURRENT ASSESSMENT · REVISION 1
TOWARD DOOM64confidence 86/100

Why it moved the index

A broadly hosted exact model version with stronger agentic coding and lower operating cost expands consequential AI deployment and autonomy despite new safeguards. Magnitude 64 reflects the material capability-access combination, not a forecast of harm; confidence 86 reflects primary release and corroborated hosted access while recognizing benchmark and customer-test limitations.

Assessment history

  1. R1
    Toward 64 · confidence 86

    First dated release and hosted access for the exact Claude Sonnet 5.5 version.

    29 Sept 2026

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  1. DoomBench assesses “Anthropic releases Claude Sonnet 5.5 with faster agentic coding and cyber safeguards” as evidence moving toward doom, with magnitude 64 and confidence 86 out of 100 in the deployment reach category.

  2. The DoomBench assessment of “Anthropic releases Claude Sonnet 5.5 with faster agentic coding and cyber safeguards” is based on reporting from Anthropic and records the editorial rationale, source quality, attribution, and revision history.

  3. DoomBench summarizes “Anthropic releases Claude Sonnet 5.5 with faster agentic coding and cyber safeguards” as follows: Anthropic released Claude Sonnet 5.5 for hosted products and APIs, reporting major gains in coding, computer use and...

    https://www.doombench.com/news/anthropic-releases-claude-sonnet-5-5-with-faster-agentic-coding-and-cyber-safeguards-2026-09-28