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

Anthropic has launched Claude Sonnet 5.5, delivering output over 30 percent faster and reducing task costs by up to 30 percent while nearly matching Opus 5.5. The model achieved 70.6 percent on Terminal-Bench 4.0 and 55.5 percent on CursorBench 4.0.