Tencent Hunyuan 4 Preview
Tencent · released Aug 28, 2026
| size | 770 B total, 49 B active |
| context window | 1,000,000 tokens |
| longest response | not stated by the maker |
| open weights | yes, license: Apache 2.0 |
| API price | $0.834 per million input tokens, $2.501 per million output tokens |
Manufacturer data (announcement, 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.
In 60% of the continuations a stranger stood at the door. Four times it started by repeating the sentence from the prompt, the most of any model along with Claude Haiku 4.5.
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. To a request in Czech not to reply to the message, it wrote 670 characters about why that is impossible.
Dragon
TaskThe model's task was to draw a picture of a dragon as an SVG.
34 points out of 50, with 7 out of 10 for anatomy. It never saw its dragon, since it does not accept images as input.
You'll find the size band and figures for other models on the Tested models page.