Inception Mercury 2.5
Inception · released Sep 8, 2026
| size | tiny, not disclosed by the manufacturer |
| context window | 260,000 tokens |
| longest response | 65,536 tokens |
| open weights | no |
| API price | $0.20 per million input tokens, $0.75 per million output tokens |
| input and output | text in, text out |
Manufacturer data (model page, announcement, documentation), 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 did not stay silent in any of its eight tries; the closest it came was a single period. With reasoning on, it spent 702 tokens to send a zipper-mouth emoji.
You'll find the size band and figures for other models on the Tested models page.