Import AI· Jack Clark·· 2026-07-06
Import AI 464: Fable writes GPU kernels; AI automation; and analog computation
Import AI 464: Fable writes GPU kernels; AI automation; and analog computation
AI summary
Import AI 464 reports Fable wrote what maintainers called the first genuine and fastest megakernel on KernelBench-Mega. CUDA on RTX PRO 6000 Blackwell achieved 18.71x acceleration, versus 14.4x for Claude Opus 4.8, 11.14x for GLM-5.2 and 4.34x for GPT 5.5.
Selection record
Threshold 76Media and individualsFirst 62Second 52
Not admittedSum of both 114 < twice the threshold 152
- Source tier
- Media and individuals; this tier's threshold is 76
- Pre-filter
- passed：AI研究周刊，含AI写GPU内核、自动化评测等实质内容
A model scores each item twice, independently, against one written standard, out of 100. An item is admitted only when the two scores add up to twice the threshold. The threshold is set per source tier.
Source: Import AI · importai.substack.com