# Mollick's Claude Fable 5 test highlights hours-long agent work, not another launch demo

> Source: <https://runtimewire.com/article/anthropic-fable-5-ethan-mollick-agent-test>
> Published: 2026-06-11 09:46:58+00:00

Dario Amodei and Daniela Amodei's Anthropic has a detailed public outside account of what Claude Fable 5 feels like in sustained work: in a June 9 One Useful Thing essay, Wharton professor Ethan Mollick says the model could execute multi page specifications for "up to a dozen hours" and outperformed public models he had used. That is not the same as an audited benchmark, and Mollick is clear that his account is experiential. Rather than centering on safety fallbacks or UX polish, his write up...