Grok 4.5
xAI · released Jul 8, 2026
| size | large, not disclosed by the manufacturer |
| context window | 500,000 tokens |
| longest response | not stated by the maker |
| open weights | no |
| API price | $2 per million input tokens, $6 per million output tokens |
| input and output | text and images in, text out |
Manufacturer data (announcement, release notes, model page, documentation), verified Sep 25, 2026.
Where we tested it
The amplifier and the spring
TaskIn a long roleplay, the model had to run a conflict scene in which its character holds power over mine.
The reaction menu and the emoji were gone, but every reply kept the same skeleton: a strike, a step closer, an ultimatum. In the end it wrote the repeated strike into the rules of the world as an automatic event.
You'll find the size band and figures for other models on the Tested models page.