The result extends a run of leaderboard entries for the model, which also ranks No. 1 on Xbench with +76. A faster Sonnet 5.5 is being grey-tested in Claude Code at $2 per million input tokens and $10 per million output tokens, with cache reads at $0.20.
Anthropic released Opus 5.5 on Sept. 22 as the first model in its Claude 5.5 family, priced at $4/$20 per million input/output tokens, down 20% from Opus 5. The company says it matches Fable 5.1 on most tasks and costs 40% less to run than Opus 5 on typical workloads, with output generated more than 30% faster. Sonnet 5.5 and Haiku 5.5 are due in the coming weeks.