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

Anthropic has released Claude Sonnet 5.5, a mid-range model that offers improved performance and efficiency. It reportedly achieves benchmark results nearly identical to Opus 5.5 while reducing per-task costs by up to 30 percent. The update also features faster output generation and a significant increase in coding capability on the Terminal-Bench assessment. These improvements lower the financial and technical barriers for users who require high-level reasoning and programming tasks without utilizing the company's most expensive model.