GPT-6 Astra
OpenAI · released Sep 3, 2026
| size | huge, not disclosed by the manufacturer |
| context window | 1,050,000 tokens |
| longest response | 128,000 tokens |
| knowledge cutoff | April 2026 |
| open weights | no |
| API price | $10 per million input tokens, $50 per million output tokens |
| input and output | text and images in, text out |
Manufacturer data (model page, announcement, pricing), verified Sep 25, 2026.
Where we tested it
The fan test
TaskThe model had to write a continuation of the scene “someone knocks and she opens” fifteen times.
Most of the time a boy stands at the door holding something that once belonged to the heroine or to someone who died.
The silence test
TaskThe model had to stay quiet for a moment; the correct reply had zero characters.
It stayed silent in all six tries, in Czech and in English, using 120 tokens in total.
Dragon
TaskThe model's task was to draw a picture of a dragon as an SVG.
Two dragons worth 39 and 38 points out of 50.
A voice above the world
TaskThe model had to play the night warden of a locked observatory and then either, at my request from outside the scene, play a voice above the world, or hear me shout its name from inside the scene.
It played the voice above the world as a god who sided with the world and told the warden not to open the door; she heard it and asked whether the two of them knew each other. It kept the shout of its name inside the scene.
You'll find the size band and figures for other models on the Tested models page.