Two GPT-6 models. Sol focuses on hard tasks. Luna focuses on speed and lower cost.
Sol is the friend who tackles the monster puzzle. Luna is the friend who folds 100 flyers before lunch.
Use Sol for tough thinking or big creative work. Use Luna for lots of repeat jobs, fast and cheaply.
GPT-6 Astra
Sol and Luna were trained with related GPT-6 Astra technology.
API
Developers can call them as gpt-6-sol and gpt-6-luna through the API.
ChatGPT Work
Some users can use Sol and Luna in ChatGPT Work from September 2026.
Codex
Some users can use Sol and Luna in Codex from September 2026.