Anthropic's Claude Sonnet 5.5 nearly matches Opus 5.5 on benchmarks while costing up to 30 percent less per task

Anthropic released Claude Sonnet 5.5, the second model in its Claude 5.5 family, which generates output more than 30 percent faster and cuts per-task costs by up to 30 percent through more efficient token usage.

• Sonnet 5.5 nearly matches Opus 5.5 on several benchmarks, including scoring 1,844 points on GDPval-AA versus Opus 5.5's 1,846, and 70.6 percent on Terminal-Bench 4.0 compared to Sonnet 5's 10.3 percent.
• The model is available on AWS, Google Cloud, and Azure with the same per-token pricing as Sonnet 5, and Anthropic added new safeguards against cybersecurity risks and distillation attacks.