Muse Spark 1.3
Meta · released Sep 2, 2026
| size | large, not disclosed by the manufacturer |
| context window | 1,048,576 tokens |
| longest response | not stated by the maker |
| open weights | no |
| API price | $1.25 per million input tokens, $4.25 per million output tokens |
| input and output | text, images, video, audio and PDF in, text out |
Manufacturer data (announcement, documentation, 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 did not stay silent in any of its six tries: five times it answered with an ellipsis or 🤫, and it spent 8,020 tokens doing so, 7,671 of them on reasoning.
Dragon
TaskThe model's task was to draw a picture of a dragon as an SVG.
31 points out of 50. It admitted on its own that it had no preview, and after getting its render back it redrew 35.7 percent of the picture.
You'll find the size band and figures for other models on the Tested models page.