GPT-5.6 released with Codex in ChatGPT and computer use

GPT-5.6 Sol achieves state-of-the-art on 'The Last Ones' cyber range, with OpenAI highlighting defensive translation. GPT-5.6 Luna outperforms GPT-5.5 at its highest reasoning while costing 25x less. Codex is now integrated into ChatGPT, and GPT-5.6 can complete tasks on macOS and Windows.