Claude Sonnet 5.5

Trends

• Frontier capability gets cheaper with every release
• Frontier cyber capability ships to defenders behind gated access
• Labs treat distillation of their models as a security threat

Items

1. Sep 28

   Anthropic's Claude Sonnet 5.5

   The second model in the Claude 5.5 family runs 30%+ faster and up to 30% cheaper per task than Sonnet 5, scores 70.6% on Terminal-Bench 4.0, and is the first Sonnet to ship with cyber safeguards and anti-distillation reasoning classifiers.