Key Info

Claude Sonnet 5.5 is now live in Command Code, running 30% faster and costing 30% less than Opus 5.5, and reportedly beating Opus 5.5 on Terminal-Bench 4.0.

Highlights

  • Available across GOAT, Pro, Max and API plans.
  • Early tests show strong performance gains.
  • Positioned as a faster, more cost-efficient alternative to Opus 5.5.