Claude Sonnet 5.5

Updates

AnthropicCapability change· 1h ago

Expanding the Cyber Verification Program

Anthropic expanded its Cyber Verification Program (CVP) into three access tiers—Defense Access, Red Team Access, and Specialized Access—each with different verification requirements and security controls. The program provides qualifying security professionals access to advanced models including Claude Opus 5.5, Claude Sonnet 5.5, and Claude Mythos 5.1, with reduced blocking classifiers for cyber work. Existing Project Glasswing members will transition to the Specialized Access tier without needing reapproval for current models.

AnthropicModel update· 8 days ago

Introducing Claude Sonnet 5.5

Anthropic released Claude Sonnet 5.5, the second model in the Claude 5.5 family, as a faster and lower-cost complement to Claude Opus 5.5. It runs 30%+ faster than Sonnet 5 and costs up to 30% less per task, with the same per-token pricing but fewer tokens needed. Sonnet 5.5 scores 70.6% on Terminal-Bench 4.0, up from Sonnet 5's 10.3%, and is the first Sonnet model to launch with cyber safeguards and fallbacks.