Claude Sonnet 5.5

Overview

Second model in the Claude 5.5 family, launched September 28, 2026 as a faster, lower-cost complement to Opus 5.5 for well-scoped coding, documents, slides and spreadsheets. Official pricing is $2 per million input tokens, $10 per million output tokens and $0.20 per million cache-read tokens, the same as Sonnet 5; Anthropic says it runs 30%+ faster and costs up to 30% less per task because it uses fewer tokens. Available as claude-sonnet-5-5 on the Claude API, Amazon Bedrock, Google Cloud and Microsoft Azure. Haiku 5.5 remains unshipped.

Generally available September 28, 2026 on the Claude API, Amazon Bedrock, Google Cloud and Microsoft Azure. Distinct from Opus 5.5, which launched September 22.