Anthropic Launches Claude Sonnet 5.5, Nearing Opus Performance at Half the Price
Summary
Anthropic launches Claude Sonnet 5.5, a mid-tier model it says runs 30% faster, approaches Opus 5.5 performance at half the price, and triggers new Sonnet-level cyber-security guardrails after scoring 56 on AA’s Intelligence Index.
Key Points
- Anthropic launches Claude Sonnet 5.5, a 30% faster mid-tier model that nears Opus 5.5 performance at half the price.
- Sonnet 5.5 scores 56 on AA’s Intelligence Index, surpassing Fable 5.1 and GPT-6 Astra at 53.
- Its cyber capabilities trigger the first Sonnet-tier guardrails, including security fallbacks previously used for Opus and Fable restrictions.