Claude Sonnet 5.5
A proprietary hosted Claude Sonnet version optimized for faster and less costly agentic coding and knowledge work. Anthropic reports stronger benchmark results and early customer testing, alongside cyber fallbacks, biology controls, anti-distillation classifiers and containment evaluations.
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Why this model scores 85.7
Capability 93 and autonomy 92 reflect strong coding, computer-use and long-horizon tests but limited unsupervised real-world evidence. Deployment 97 reflects broad Claude, API and cloud access at lower per-task cost. Misuse 82 reflects improved cyber capability, moderated by hosted restrictions. Control difficulty 62 accounts for stronger containment evaluations and safeguards without assuming they catch every failure.
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News tied to Claude Sonnet 5.5
The model score of 85.7 rates this model's risk profile. The overall Doom Index of 68.0 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.
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.
- Full item contribution
- +0.15
- Claude Sonnet 5.5 equal share
- +0.15
Model score history
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R1
Doom Score 85.7
Dated Anthropic Sonnet 5.5 release establishes exact version, hosted availability and updated five-dimension evidence; proprietary hosted access follows official commercial terms.
29 Sept 2026