# Claude introduces Opus 5.5 as the first Claude 5.5 model

Claude says Opus 5.5 performs at the level of Claude Fable 5.1 for most tasks and costs 40% less to run than Opus 5. Pi says users who want it in Pi can wait or run pi update --models.

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Source: Pi · Published 9/22/2026, 10:00:29

Claude introduces Claude Opus 5.5 as the first model in the Claude 5.5 family. Claude says it performs at the level of Claude Fable 5.1 for most tasks and costs 40% less to run than Opus 5.

Pi says users who want the model in Pi can wait or run pi update --models.

Tags: Claude, Claude Opus, Pi, Model release

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