OpenAI's GPT-5.6 lineup includes the Sol, Terra, and Luna models, with a focus on enhanced computer use and the ability to navigate desktop applications. The models demonstrate improved visual understanding, which will be evaluated using an upcoming visual language model benchmark.

Fable 5 outperformed GPT-5.6 Sol on an NP-hard optimization problem. The use of the /goal mode did not significantly enhance performance for either model.