Diode Computers built three functioning electronics prototypes from designs generated by Claude Fable 5.2, offering a hardware test that spans circuit-board layouts, firmware and component selection.
The hardware set paired a speakerphone and voice-assistant hub with a handheld virtual pet. After a short request, Fable supplied technical specifications, schematics, PCB designs, firmware and a parts list. Diode Computers assembled the devices under the model’s direction; each ran without circuit redesign.
PCB Gym, an internal test of board component placement and connection routing, put Fable 5.2 at 69%, 44 percentage points above Fable 5’s 25%. BenchCAD covers a separate area, assessing whether models can recreate components and assemblies in three dimensions.
Fable 5.2 also revised its board plans during the design process. For the speakerphone, it moved signals to alternate chip pins, easing copper-routing congestion and freeing board space. On the assistant hub, it redrew paths where connections crossed. Its designs specified routes and spacing for USB and Ethernet conductors to preserve signal timing.
On public benchmark BenchCAD 2.1, Fable 5.2 scored 83.5%, nearly double Fable 5.1’s result. A separate AA-3D leaderboard result measured interactive scene-building, a different task from electronics design.
These remain early prototypes. The builds do not establish reliability over extended use or whether the devices meet commercial certification standards.
