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Capability gains

Anthropic releases Claude Opus 4.1

Anthropic released Claude Opus 4.1 with improved agentic tasks, coding and research performance through the API, Claude and major cloud platforms.

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CURRENT ASSESSMENT · REVISION 1
TOWARD DOOM47confidence 94/100

Why it moved the index

A stronger exact frontier checkpoint improved released coding, research and agentic performance while retaining broad commercial access.

Assessment history

  1. R1
    Toward 47 · confidence 94

    New exact August 2025 model release with API identity claude-opus-4-1-20250805 and no durable collision.

    12 Aug 2026

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  1. DoomBench assesses “Anthropic releases Claude Opus 4.1” as evidence moving toward doom, with magnitude 47 and confidence 94 out of 100 in the capability gains category.

  2. The DoomBench assessment of “Anthropic releases Claude Opus 4.1” is based on reporting from Anthropic and records the editorial rationale, source quality, attribution, and revision history.

  3. DoomBench summarizes “Anthropic releases Claude Opus 4.1” as follows: Anthropic released Claude Opus 4.1 with improved agentic tasks, coding and research performance through the API, Claude and major cloud platforms.

    https://www.doombench.com/news/anthropic-releases-claude-opus-4-1-2025-08-05