Claude Opus 4.1
Frontier Claude checkpoint improving coding, agentic tasks and research performance.
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Why this model scores 76.4
Improved coding and agentic task performance raise capability and autonomy; broad API and cloud access raise deployment, while closed weights and provider safeguards moderate misuse and control difficulty.
News tied to Claude Opus 4.1
The model score of 76.4 rates this model's risk profile. The overall Doom Index of 67.9 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.
Frontier models gain physical control when paired with pretrained robot policies
Anthropic evaluated twelve models from five providers across simulated and physical robotics tasks. Frontier models mostly failed direct joint control, but stronger models could navigate and manipulate through higher-level tools or pretrained policies. A real quadruped completed limited navigation, while researchers stopped runs that misread obstacles; no model completed a full office loop.
- Full item contribution
- +0.13
- Claude Opus 4.1 equal share
- +0.02
METR finds low sabotage risk in Claude Opus 4 and 4.1 after independent review
METR reviewed unredacted evidence and agreed that catastrophic sabotage risk from Claude Opus 4 and 4.1 was low, while warning that reasoning-hiding and evaluation-awareness claims were overconfident. Anthropic said the review led it to revise threat models and alignment practices, including training changes for reasoning monitorability.
- Full item contribution
- -0.19
- Claude Opus 4.1 equal share
- -0.09
Safety-institute red teams harden Anthropic's Claude jailbreak defenses
Anthropic reported that US CAISI and UK AISI tested Constitutional Classifiers around Claude Opus 4 and 4.1 using prompt injection, universal-jailbreak, and cipher attacks. Anthropic patched vulnerabilities and restructured parts of the defense architecture before wider deployment.
- Full item contribution
- -0.19
- Claude Opus 4.1 equal share
- -0.09
Anthropic deploys conversation-ending safeguards in Claude
Anthropic enabled Claude Opus 4 and Opus 4.1 to end a narrow subset of persistently harmful conversations after other response strategies fail.
- Full item contribution
- -0.06
- Claude Opus 4.1 equal share
- -0.03
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.
- Full item contribution
- +0.15
- Claude Opus 4.1 equal share
- +0.15
Model score history
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R4
Doom Score 76.4
Source-backed model availability audit using the model's existing primary or authoritative catalogue evidence. Exact-version evidence chronology replayed under temporal-monthly-pressure-v4.
12 Aug 2026 -
R3
Doom Score 76.4
Exact-version evidence chronology replayed after run doombench-hourly-news-20260812-142416 under temporal-monthly-pressure-v4.
12 Aug 2026 -
R2
Doom Score 75.4
Exact-version evidence chronology replayed after run doombench-hourly-news-20260812-132112 under fixed-sensitivity-v3.
12 Aug 2026 -
R1
Doom Score 73.0
New exact August 2025 checkpoint with immutable API identity.
12 Aug 2026