Sol, Terra, and Luna, our GPT‑5.6 family of models, are starting to roll out now in ChatGPT, Codex, and the API.

OpenAI has announced the rollout of its GPT-5.6 family of models, consisting of Sol, Terra, and Luna variants, across ChatGPT, Codex, and API platforms. These models represent the latest iteration in OpenAI's GPT-5 series and are being made available to users and developers for general use. The announcement indicates a major release expanding access to advanced language capabilities across OpenAI's product ecosystem.

Source: OpenAI (X) | 2026-07-09