Model release · Anthropic
claude-sonnet-5-5
- Model released
- Review updated
Second Claude 5.5 family model (2026-09-28); ~30%+ faster output vs Sonnet 5 and up to ~30% lower cost per typical task; same list price as Sonnet 5: $2/$10 /MTok (cache read $0.20, write $2.50); Adaptive thinking (default effort High on API / Medium in apps); large coding & knowledge-work gains vs Sonnet 5; ships with Opus-class cyber safeguards + preserved thinking; Haiku 5.5 coming weeks
Availability
Claude API/Platform claude-sonnet-5-5; Amazon Bedrock / Google Cloud / Microsoft Azure; Claude.ai / Claude Code apps; Cursor