Generally AvailableClaude Sonnet 5.5
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.