Runway Gen-4.5
Runway Gen-4.5 is a strong choice for controlled short clips from text or images. Use it when you want Runway's cinematic look, clear prompt-to-shot behavior, and start/end frame guidance for concise video generation.
Best for
- short cinematic clips
- start/end frames
- controlled I2V
- Runway look
Use when
- You want text-to-video or image-to-video with a concise duration.
- You have start and optional end frames to guide the clip.
- You prefer Runway's visual language for cinematic or ad-like clips.
Avoid when
- You need video-to-video transformations; use Runway Aleph 2.0.
- You need native audio as part of generation; compare Veo, Seedance, Grok, or Happy Horse.
Inputs
- prompt
- optional start frame
- optional end frame when start is present
Outputs
- video
DayGen surfaces
- /video/create
- Agent video generation
Available settings
- Mode
- Text, Start Frame, Start and End Frames
- Aspect Ratio
- 16:9 (Wide), 9:16 (Story), 1:1 (Square), 4:3 (Classic), 3:4 (Portrait), 21:9 (Cinema), 9:21 (Ultra-tall portrait)
- Quality
- Provider-defined
- Duration
- 2–10s
- Audio
- No native audio