OpenAI’s GPT‑5.6 models are here, with a trio of options balancing power and performance

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.