Models
GPT-5.6 Sol, Terra, and Luna go generally available
OpenAI put the 5.6 family into ChatGPT, Codex, and the API. Sol is the flagship, Terra the balanced tier, Luna the cheap fast one, plus an ultra mode that splits work across agents.
OpenAI put the 5.6 family into ChatGPT, Codex, and the API. Sol is the flagship, Terra the balanced tier, Luna the cheap fast one, plus an ultra mode that splits work across agents.