It's double the cost in Flow, but 30% cheaper via the API. And Flow has always been much cheaper than the API (by 5-6x).

Right now

Omni 1.2 is showing 18 credit cost in Flow for a six second video.

vs.

10 credits costs for a 6 second video using Omni 1.1.

I'm not sure it's in Google's interest to talk about how much cheaper the model is, while also increasing the cost in Flow.

(but I'm happy for people using the API)