More references, higher resolution and a large benchmark jump.
If you already use Vidu Q3, this is the comparison that matters. Specs come from Vidu's own model pages. Ranking and cost come from Artificial Analysis, as reported by AlphaSignal.
Where Vidu Q4 wins: reference control and image quality. This studio accepts up to 12 images and 3 voice clips, while Vidu's official service lists up to 15 images. Q4 outputs up to 4K, and the October 7 benchmark snapshot placed it 16 spots above Q3 Pro while costing 25% less per minute in that test. Those benchmark prices are separate from this studio's credit rates.
Where Vidu Q3 still wins: Vidu publishes English, Japanese and Chinese output and multi-person conversations for Q3, and none of these are listed for Vidu Q4 Preview yet. Q3 is a finished release, while Q4 features and pricing may still change.
Pick Vidu Q4 when you have references and need consistency or 4K. You can also try Q3 for its published language support. In the October 7 snapshot, MiniMax H3 Max ranked first at 1,195 Elo, 16 points ahead of Vidu Q4 Preview.