Pricing and context window via OpenRouter, 2026-11-13.
Sonnet 5.5 replaces Sonnet 5, with Anthropic claiming 30% faster performance, lower token costs, and cyber capabilities now comparable to Opus 5, triggering the same cyber safeguards applied to Opus and Fable.
| Benchmark | Score | Rank | Source |
|---|---|---|---|
| AA Intelligence Index | 54.5 index | 6 of 47 | Artificial Analysis, Nov 2026 ↗ |
| Arena Elo | 1472 Elo | 33 of 140 | LMArena, Nov 2026 ↗ |
| Speed (tok/s) | 145 tok/s | 19 of 100 | Artificial Analysis, Nov 2026 ↗ |
Rank is against every model in our database with a sourced score on that benchmark, each counted once with its best score.
Anthropic has released Sonnet 5.5, the latest version of its mid-tier Claude model, claiming 30% faster performance and significantly lower token costs than its predecessor. The company says the model now outperforms Opus 5.5 on agentic coding tasks and carries cyber capabilities comparable to Opus 5.