Live drop
AnthropicDropped Sep 22, 20262 builds2 makers
Agentic coding and knowledge work at Fable 5.1 performance with 40% lower run cost.
About this release
Claude Opus 5.5 is the first model in Anthropic's new 5.5 family. It matches Claude Fable 5.1 performance on most agentic coding, computer use, and professional knowledge tasks while costing roughly 40% less to run than the prior Opus 5 on typical workloads. Input/output pricing is $4/$20 per million tokens with further reductions on cache reads. It ships with enhanced safeguards and clearer output formatting for long-running agent workflows.
Read the official Anthropic launch pageWorth opening first
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