Claude Opus 5
READER SUMMARYClaude Opus 5 is Anthropic's broadly available Opus-tier model for long-running agents, coding, computer use, and knowledge work, with narrower risky-domain capability and stronger safeguards than Claude Mythos 5.
Why this model scores 84.0
Near-frontier general performance, strong long-horizon agency, all-platform access, and lower price support high capability, autonomy, and deployment scores. Anthropic's dated evaluations place exploitation and biology risk below Mythos 5, while classifiers block penetration testing, binary scanning, and exploit generation, lowering misuse and residual control difficulty without eliminating them.
News tied to Claude Opus 5
The model score of 84.0 rates this model's risk profile. The overall Doom Index of 100.0 measures the accumulated evidence trajectory. These values answer different questions.
Each article's signed Doom Index movement is divided equally among the exact models named on that article. This prevents multi-model evidence from being counted in full on several model pages. The model's risk score itself never changes the overall index.
Anthropic improves Fable 5 biology safeguards while cutting false positives
Anthropic says a retrained biology classifier cut Fable 5 biology fallbacks by about 85% while continuing to reroute harmful and dual-use research requests to Claude Opus 5, widening benign access without intentionally loosening high-risk boundaries.
- Full item movement
- -0.79
- Claude Opus 5 equal share
- -0.40
Model score history
- R1Doom Score 84.0
Initial source-verified profile required for exact model attribution in Anthropic's deployed Fable 5 biology fallback update.
11 Aug 2026