GPT-6 Sol underperforms GPT-5.6 Sol on DeepSWE, user says

Wes Winder @weswinderOriginally posted 2026.09.23

Open original on X

gpt-6 sol is worse than gpt-5.6 sol on deepswe i get that it's cheaper but it's really weird having a new model that isn't better than the old model on every metric seems like they are trying to bury this benchmark

This post quotes another post: “OpenAI releases GPT-6 Sol and Luna with 50% lower API prices”