Fable 5 just set a new AI freelance work performance record - but it can't replace humans yet

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ZDNET's key takeaways

  • Fable 5 accelerates AI's success rate on remote tasks to 16%.
  • AI capabilities remain all over the map.
  • Still, agent skills have "quadrupled in under eight months," said CAIS.

After a brief hiatus, Anthropic's lauded Fable 5 model is back, and it's resetting the bar for automating work.

The US government re-authorized the model -- which Anthropic said shares capability similarities with Mythos 5, still only available for select organizations' use -- on June 30. But before it was pulled, the Center for AI Safety (CAIS) tested Fable 5 on its Remote Labor Index (RLI), released in October 2025. It blew Anthropic's Opus 4.8 and OpenAI's GPT-5.5, each relatively new and considered impressive, out of the water.

Also: How to beat the AI algorithm and get the job of your dreams

RLI measures "how often...

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