Bonsai 27B is a full open reasoning model that fits on an iPhone

PrismML has released Bonsai 27B, a reasoning-focused AI model compressed to under 4 GB, allowing it to operate directly on iPhone hardware. By maintaining 90 percent of its original performance despite significant shrinking, the model demonstrates that advanced reasoning capabilities can be deployed locally on consumer mobile devices. This development suggests a shift toward high-performance edge computing, potentially reducing reliance on cloud-based servers for complex AI tasks.