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September’s new models have been arriving one after another like dumplings dropped into the pot, but most of them only hold the spotlight for a day or two before the next release steals the show.
Just now, Anthropic officially released Claude Opus 5.5. It is the first model in the Claude 5.5 family, with Sonnet 5.5 and Haiku 5.5 still to come over the next few weeks.
Opus 5.5 is not a routine half-generation upgrade. According to the company, its performance on most tasks already reaches the level of Claude Fable 5.1. Compared with Opus 5, typical-task cost is down 40%, and output speed is up by more than 30%.
A half-generation upgrade, with Opus performance now close to Fable
Anthropic positions Opus 5.5 as a workhorse model for long-running coding agents and knowledge work. Official results show clear gains in agentic coding, computer use, and professional tasks.
