OpenAI releases the GPT-5.6 family: Sol, Terra, and Luna
The GPT-5.6 family reached general availability on Wednesday: Sol as the flagship, Terra as the everyday model at half the price of the previous generation, and Luna as the fast, cheap tier. Context grows to 1.5 million tokens, and OpenAI claims state of the art coding results on Terminal-Bench 2.1 and DeepSWE, plus an ultra setting that coordinates four parallel agents on hard tasks.
The claim aimed at readers of this page sits lower in the post: a step change in design judgment. Stronger computer use lets the model open and inspect the interface it just produced, catch visual and functional defects, and apply finishing touches before handing the work back. Self critique of the rendered result, long a human review step, is now a launch feature.
General availability closes a two week gated preview in which the U.S. government helped vet who got early access, a first for a frontier release and a storm on every forum that covered it.
| Body | Role | Input | Output |
|---|---|---|---|
| Sol | Flagship | $5.00 | $30.00 |
| Terra | Everyday work | $2.50 | $15.00 |
| Luna | Fast and cheap | $1.00 | $6.00 |
Fig. II aThe family drawn to price scale: each disc's area tracks its input price per million tokens, so the eye reads the real ratio, five to two and a half to one.