Model release · Anthropic
Claude Opus 5.5
- Model released
- Review updated
The first model in the Claude 5.5 family. API pricing is $4 for input and $20 for output per million tokens. Anthropic reports roughly 40% lower costs on typical workloads than Opus 5, not a 40% cut to every rate. Available via Claude Platform, Bedrock, Google Cloud, and Azure.
Details
First Claude 5.5 family model; ~40% cheaper typical vs Opus 5; $4/$20 /MTok (cache read $0.20, write $5; Opus 5 was $5/$25, cache read $0.50); Fast mode $8/$40 up to ~2.5x speed; strong alignment audit; cyber/bio safeguards similar to Fable 5.1 (Life Sciences / Cyber verification); preserved thinking; Sonnet/Haiku 5.5 coming weeks
Availability
Claude API/Platform claude-opus-5-5; Amazon Bedrock / Google Cloud / Microsoft Azure; Claude apps incl. Claude Code