Claude Fable 5 is now live in Devin across Cloud, Desktop, and CLI.
Claude Fable 5 earned the top score on FrontierCode, our proprietary benchmark that grades models on real-world tasks based on quality and mergeability. It excels at long-horizon reasoning and debugging, and it generalizes to unfamiliar tools out of the box, from MCP integrations to computer use.
It earns the #1 score on FrontierCode, our benchmark for real-world engineering tasks graded on mergeability and quality.
Fable 5 also pushes the score-vs-output-tokens frontier, delivering higher scores without runaway token usage.
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