Claude Opus 5.5 launches
Anthropic says the model performs at Claude Fable 5.1’s level for most tasks and costs 40% less to run than Opus 5.
TLDR
Anthropic announced Claude Opus 5.5 on September 22 as the first model in its new Claude 5.5 family. The company says it performs at Claude Fable 5.1’s level for most tasks and costs 40% less to run than Opus 5. A user highlighting projects made with the model singled out a game about the discovery of the Antikythera mechanism.
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