Get to know Sol, Terra, and Luna. • Jul 9, 2026 — 1:27 PM ET • • Edgar Cervantes / Android Authority TL;DR Open AI formally welcomes the GTP-5.6 models to its lineup: Sol, Terra, and Luna. In addition to the new modesls themselves, there’s also a new “ultra” option for running multiple models in parallel. Access to all three GPT-5.6 models opens today in ChatGPT and Codex, but may take 24 hours to hit everyone.