Veo 3.1 vs Grok Imagine Video

Pick Veo 3.1 when…

• The clip is a final deliverable and 20 extra credits per render is not the constraint
• You have settled on the shot and are rendering the version that ships
• You need the higher ceiling — up to 1080P output
• The brief leans on improved motion

Trade-off: You pay 20 more credits on every generation; You wait 15s longer per clip; You are capped at 8s per clip and will need extension or a cut for anything longer.

Pick Grok Imagine Video when…

• You are generating in volume and the 20-credit difference per clip adds up fast
• You are still exploring and need a tight generate-judge-regenerate loop (~60s / 5s clip versus ~75s / 5s clip)
• The shot cannot be cut — you need up to 15 seconds in one generation rather than 8
• The brief leans on native audio

Trade-off: Output characteristics differ, but neither model gives up a hard capability to the other.

Vendor angle

These come from different vendors — Google and xAI — 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 150 credits in total (85 + 65). 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.