Source record

Published by Amp News (ampcode.com) (T1 source). The original is at https://ampcode.com/news/fable-5.1.

Pipeline notes

The summary and note below are generated by the signal pipeline — they are Beyond Desk’s reading, not quotations from the source.

Amp announces Claude Fable 5.1 now powers its ultra mode, citing improvements in long-horizon task execution, self-verification, mid-task steering, and prose quality, with examples including an iOS typing latency drop from 85ms to 8ms and a 45% faster thread creation flow.

First-party report on a model upgrade with concrete before/after metrics and an example of hours-long autonomous iteration, useful for weighing adoption in agentic coding setups.

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