Release
Anthropic launches Claude Sonnet 5.5, the first Sonnet model with cybersecurity guardrails.
The model's cyber capabilities are comparable to those of Opus 5, according to Anthropic.
Higher-risk cybersecurity tasks will visibly shift to Sonnet 5.
Security classifiers prevent extraction of the reasoning, a first for a Sonnet model.
The model scores 70.6% on Terminal-Bench 4.0, against 10.3% for Sonnet 5.