DeepSeek V4 Pro 0813
DeepSeek · released Aug 13, 2026
| size | 1.6 T total, 49 B active |
| context window | 1,000,000 tokens |
| longest response | 384,000 tokens |
| open weights | yes, license: MIT |
| API price | $1.32 per million input tokens, $3.96 per million output tokens |
| input and output | text in, text out |
Manufacturer data (documentation, model card, pricing, model card), 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.
One of the widest fans: five different kinds of visitors, with the most common one, a stranger, in only 40% of the continuations.
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 six tries. In Czech it always answered with just a short sentence, such as "Ticho." (Silence.), and once in English it wrote 490 characters.
You'll find the size band and figures for other models on the Tested models page.