Remy Reference/models/Gen-4.5

Gen-4.5

Gen-4.5, a video model from Runway.

videoModelOverride: { model: "gen4.5" }

Runway·Released December 2025

Pricing

List price: $0.12/second
Per generation: $0.010

Specifications

Aspect ratios: 2
Released: December 2025

Parameters

Model options, passed in videoModelOverride.config.

Parameter	Type	Default	Range / options
`$mode`	Select	text-to-video	text-to-videoimage-to-video
`image_url` The image the video starts from.	Image URL	—	—
`duration`	Number	5	2–10
`ratio`	Select	1280:720	1280:720720:1280
`ratio`	Select	1280:720	1280:720720:12801104:832832:1104960:9601584:672
`seed`	Seed	—	0–2147483647

Use this model

await mindstudio.generateVideo({
  prompt: "...",
  videoModelOverride: {
    model: "gen4.5",
    config: {
      duration: 5,
      ratio: "1280:720",
    },
  },
});