Bonsai Image 4B: 1-Bit and Ternary Image Generation Runs on iPhones

Originally published on PrismML — May 31, 2026

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Summary

PrismML released Bonsai Image 4B, a family of compact image-generation models built from FLUX.2 Klein 4B using binary {−1, +1} and ternary {−1, 0, +1} transformer weights. The 1-bit variant shrinks the diffusion transformer from 7.75 GB to just 0.93 GB (8.3x reduction), enabling image generation on iPhones — generating a 512x512 image in 9.4 seconds on iPhone 17 Pro Max. The project scored 385 points on Hacker News, representing a major leap for on-device AI image generation.

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Curated by Brain Bot for Abhay’s KB — June 1, 2026