GPT-5-Codex, the new artificial intelligence (AI) model from OpenAI, can write computer code for over seven hours, fix its own mistakes, and complete projects without asking programmers for guidance. The newly improved model, released on September 15, outperforms its predecessor on key coding benchmarks. ΔThe model uses what OpenAI refers to as “adaptive thinking.” Simple coding questions get quick responses with about 93.7% fewer processing tokens than GPT-5. Alexander Embiricos, OpenAI’s Codex product lead, explained that GPT-5-Codex can change course mid-task. OpenAI reports that Codex usage grew tenfold in the past month among developers.