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  1. One Useful Thing78

    Ethan Mollick tests Claude Fable 5.2 across coding, business and research, calling it almost AGI

    2 on tasks spanning hardware hacking, business planning, humanities course building, academic research and a 450-world 3D portal project, and judged it almost AGI under his definition of matching most human experts at most computer-based intellectual tasks.

    Why it matters: Ethan Mollick's hands-on tests of Claude Fable 5.2 show strong general capability across coding, business and research, while exposing a persistent gap in self-judging when work is good enough.

  1. One Useful Thing78

    Ethan Mollick reviews Claude 5 Fable, the first public Mythos-class model

    Ethan Mollick tested Claude 5 Fable, the first Mythos-class model released to the public, and found it outperformed every other public model he has used by a considerable margin, running up to a dozen hours on multi-page specifications. In one Claude Code session it built an interactive isochrone map by spawning cheaper Claude Sonnet agents to research over 2,200 flights, rail schedules and road speeds, and in another it worked nine and a half hours to produce Concord, software for calibrating human and AI judgement.

    Why it matters: An early hands-on account of a Mythos-class model that shows how multi-hour autonomous agent runs shift the human role from steering to commissioning outcomes.

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