Can I cancel an AI video generation that is already running?

Because the capability does not exist below us. We checked directly: the cancel method on the Interactions API answers 501 UNIMPLEMENTED, and delete answers 400. Veo's long-running operations have no cancel verb either. A cancel button would only hide the job from your screen while the compute kept running and the bill stayed spent.

There is no progress stream to attach to either. Requesting a streaming read of a running interaction is refused, and the intermediate *thought* step comes back with empty content even at the highest thinking level. Status is genuinely a poll: pending, processing, then done or failed.

The charge is taken when the job starts, so a generation you regret is already paid for. If it completes, the file lands in your history and the money is spent. If it fails for any reason — model error, capacity, content filter — the refund is automatic and immediate.

For agents paying per call in USDC this asymmetry is why video is handled differently from images. Images and speech are verified first and settled only once the file exists, so a failure costs nothing. Video has to settle up front precisely because it cannot be cancelled, and a failed video is compensated with a refund token good against a later call.

Draft cheaply. A 4-second Veo 3.1 Lite clip at $0.10, or a 3-second Omni Flash clip at $0.30, answers *did it understand the shot* for a fraction of the flagship price — and if the answer is no, you have lost pennies rather than four dollars.

Fix the first frame. Generating a still, approving it, and then animating that exact image removes most of the uncertainty from a video generation: composition, wardrobe and lighting are already settled before the expensive part starts.

Leave audio off until the motion is right. On the Veo family the soundtrack roughly doubles the price, and it is the last thing worth paying for.