VIDU has improved a lot and video models Vidu 2.0 and Vidu Q1 are fast and affordable (good price for high-volume API credits). As Luma, both include Image to Video generation with FLF2V (First-Last-Frame-to-Video) and even advanced Multi-Reference. It would be a great addition.

More info:

Vidu 2.0 -> https://cme.sh/vidu2

Vidu Q1 -> https://cme.sh/viduq1