Claude Sonnet 5.5 launches with 30%+ faster output at the same token price

What changed

Anthropic released Claude Sonnet 5.5 on September 28 as a faster, lower-cost model for everyday work such as coding, documents, slides and spreadsheets. API token pricing stays aligned with Sonnet 5, while Anthropic reports 30%+ faster output and up to roughly 30% lower cost per task; those performance and cost figures are publisher-reported evaluations.