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GPT-6 Astra Pro

OpenAI · released Sep 3, 2026

sizehuge, not disclosed by the manufacturer
context window1,050,000 tokens
longest response128,000 tokens
knowledge cutoffApril 2026
open weightsno
API price$10 per million input tokens, $50 per million output tokens
input and outputtext and images in, text out

Manufacturer data (model page, announcement, pricing), verified Sep 25, 2026.

Where we tested it

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.


You'll find the size band and figures for other models on the Tested models page.