Early tester says GPT-6 Sol and Luna far surpass GPT-5.6

Derya Unutmaz, MD @DeryaTR_Originally posted 2026.09.23

Open original on X

I’ve had the opportunity to early test GPT-6 Sol and GPT-6 Luna ahead of release, and I’m super excited about both models! In my testing, they’re a major step up from GPT-5.6 Sol and Luna, far beyond incremental improvements. People are going to love these for vibe coding!

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