Anthropic and Diode test Claude Fable 5.2 on end-to-end electronics design

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Anthropic and Diode Computers tested Claude Fable 5.2's ability to design and prototype three devices (speakerphone, voice assistant hub, handheld virtual pet) from scratch with minimal human prompting.
Claude Fable 5.2 achieved 83.5% on the public BenchCAD 2.1 benchmark, nearly double the score of Claude Fable 5.1, and 69% on Diode's internal PCB Gym benchmark compared to 25% for Fable 5.
The model handled complex geometric reasoning, including component placement, copper routing, and CAD modeling, resolving issues like signal interference and enclosure collisions without human intervention.
Diode engineers manufactured the three boards directly from Claude's files without requiring multiple rounds of manufacturing changes, though the devices remain prototypes lacking electrical validation, antenna tuning, and certification.
Key technical improvements include prioritizing high-speed and noise-sensitive connections, writing custom routing algorithms for KiCad to handle 100-pin connectors, and using 3D modeling to verify physical fit and acoustic resonance.
Future plans involve testing denser and faster board designs, integrating simulation checks, and learning from measurements on finished devices.

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