Open 27B reasoning model compressed to fit on an iPhone

PrismML compressed Bonsai 27B, a 27-billion-parameter open reasoning model, to under 4GB, small enough to run on an iPhone. The company's own benchmarks show the smallest version retains about 90% of the original model's performance, with math and coding scores barely affected.

Why it matters: It's a concrete step toward capable reasoning models running fully on-device.