Grok Imagine Video vs Vidu Q3 Pro

Pick Grok Imagine Video when…

• You are generating in volume and the 3-credit difference per clip adds up fast
• You are still exploring and need a tight generate-judge-regenerate loop (~60s / 5s clip versus ~85s / 5s clip)
• The brief leans on native audio

Trade-off: You are capped at 15s per clip and will need extension or a cut for anything longer.

Pick Vidu Q3 Pro when…

• The clip is a final deliverable and 3 extra credits per render is not the constraint
• You have settled on the shot and are rendering the version that ships
• The shot cannot be cut — you need up to 16 seconds in one generation rather than 15
• You need the higher ceiling — up to 1080P output
• The brief leans on high quality

Trade-off: You pay 3 more credits on every generation; You wait 25s longer per clip.

Vendor angle

These come from different vendors — xAI and Vidu — which is where the interesting differences live. Vendors train on different data and optimise for different failure modes, so the same prompt can produce recognisably different motion, grain and lighting. On FlowAIVideo both sit behind one account and one balance, so you never have to pick a vendor before you have seen the output.

What it costs to decide

Running one clip on each costs 133 credits in total (65 + 68). A new account starts with 40 free credits, which covers Grok Imagine Video plus part of the other — enough to run a real comparison rather than reading about one. Paid plans start at 600 credits per month, and there is no per-model subscription: one balance, 22 models.