Claude Sonnet 5.5
Anthropic馃嚭馃嚫
anthropic/claude-sonnet-5.5Claude Sonnet 5.5 is Anthropic's Sonnet-class model (1M-token context, 128K max output, $2/$10 per million input/output tokens), released September 28, 2026 as a direct upgrade to Sonnet 5 and a faster, lower-cost complement to Opus 5.5. It generates output over 30% faster with fewer tokens per task, and is strongest at well-scoped everyday work such as building features, fixing bugs, and producing polished documents, slides, and spreadsheets.
Cost rate
2x
Context
1M
Released
Sep 28, 2026
Input
TextImageFile
Output
Text
Support
ReasoningTool callingStructured outputs
Best at
The categories where this model ranks highest.
Mathematical
#12 路 top 3%
Entertainment, Sports, & Media
#21 路 top 5%
Software & IT Services
#24 路 top 6%
Writing, Literature, & Language
#25 路 top 6%
Performance
Median latency and throughput measured across recent requests.
Throughput106 tok/s
Latency