
Meta shipped Muse Code on 5 August with the same model behind two IDs: muse-spark-1.2 at $1.25 per million input tokens, and muse-spark-1.2-contributor at $0.10, where your traffic may be used to train Meta's models. The discount is not a smaller model, it is a licensing decision made by editing one string. And in a harness with a 1M-token window, the prompt is whatever the agent decided to read.

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.