Claude Opus 5.5
Anthropic馃嚭馃嚫
anthropic/claude-opus-5.5Claude Opus 5.5 is Anthropic's flagship model released September 22, 2026 as the first of the Claude 5.5 family, with a 1M-token context window, text, image, and file input, and pricing of $4/$20 per million input/output tokens. Anthropic says it performs at the level of Claude Fable 5.1 on most work while costing about 40% less to run than Opus 5, and it leads on agentic coding, multi-step changes in large codebases, and long-horizon knowledge work.
Cost rate
4x
Context
1M
Released
Sep 22, 2026
Input
TextImageFile
Output
Text
Support
ReasoningTool callingStructured outputs
Best at
The categories where this model ranks highest.
Writing, Literature, & Language
#1 路 top 1%
Entertainment, Sports, & Media
#2 路 top 1%
Software & IT Services
#5 路 top 1%
Medicine & Healthcare
#6 路 top 2%
Performance
Median latency and throughput measured across recent requests.
Throughput82 tok/s
Latency