Fable 5.1

Amp released Fable 5.1, which powers its ultra mode, replacing Fable 5. The model is better at writing, long-horizon tasks, and following instructions mid-task, and costs less to run.

From the source
Claude Fable 5.1 now powers Amp's ultra mode, replacing Fable 5.
ampcode.com

Visit source ↗ampcode.com

ModelsClaude Fable 5 Claude Fable 5.1

Announced: 01 Sep 2026

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