OpenAI on June 26, 2026 unveiled its new "GPT-5.6" model family, launching three models as a "limited preview": the flagship Sol, the balanced Terra, and the cheapest and fastest Luna. The naming scheme was also overhauled, with the number now denoting generation and Sol/Terra/Luna marking capability tiers. The announcement was made on the official blog, and for now access is limited to trusted partners via Codex and the API (a small, pre-approved group of roughly 20 organizations). ChatGPT is excluded from the preview, and broad general availability is expected within a few weeks.
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