Finally can share that I have been testing GPT-5.6 early and oooo boy. It is an execution beast. So much so that I think 5.6 is the absolute…

Finally can share that I have been testing GPT-5.6 early and oooo boy. It is an execution beast. So much so that I think 5.6 is the absolute wrong name considering how big of a leap this felt to me. The OpenAI models have always felt better at ideation and “work horse”ness to me. There’s a reason several people use Claude Code to “advise” Codex. When Sonnet 3.7 came out, I think we no longer tolerated bad writing. Having GPT-5.6 and Fable 5 out in the world, I think we will no longer tolerate bad execution or slow bug fixes or unhelpful customer support …or at least tolerate a whole lot less. GPT-5.6 Sol, along with Terra and Luna, will launch publicly this Thursday. We’re expanding preview access globally now.

Source: Allie K. Miller (X) | 2026-07-08