AI

GPT-5.6 Rewrote Its Own GPU Kernels. The Reviewer Was a Floating-Point Sanitizer.

OpenAI cut GPT-5.6 Luna 80 percent on July 30, three weeks after general availability, funded by Sol rewriting OpenAI's own production GPU kernels and its speculative-decoding draft model. The transferable part is not the discount, it is FpSan, the floating-point sanitizer built to verify kernels no human read line by line.