Act Two
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runway/act-two · by Runway · Diffusion transformer (DiT)
Pricing — 1 offering(s)
Standard
- $0.050 / second Current 2025-07-21 → present
Showing the active price and any recorded history. Full pricing history is available via the paid API — see API docs.
Capability profile
Prompt adherence weak
temporal consistency strong
motion quality strong
native audio strong
camera control weak
character consistency strong
Resolution ceiling moderate
Inference speed strong
clip duration ceiling moderate
image to video quality strong
Compositional accuracy unknown
cost efficiency strong
video editing weak
Operator guidance
Choose Act Two when you need to animate a character (image or video) using a live performance — motion, expressions, gestures, and audio all transfer from the driver video. At $0.05/s it is extremely cost-effective for this specialized use. This is NOT a general-purpose video editor: Act Two does not modify existing footage via text prompts (see video-editing dimension). Compare with Kling 2.1's character reference conditioning, which anchors identity across a new generation but does NOT transfer motion from a performance driver.
Use cases
- Animating character images with realistic full-body performances from a webcam/actor video
- Transferring professional actor performances to animated or photorealistic characters
- Multi-character dialogue scenes with a single actor driving multiple characters
- Dubbing and re-performance for localization workflows
Limitations
- Driver video required for every generation — no text-only mode
- When character reference is a video, only facial/expression control is available (no full-body gestures)
- When character reference is an image, environment and camera motion come from the driver video
- Output capped at 10 seconds
- No mask-guided inpainting or prompt-driven element replacement
- Not a general video editor — limited to performance transfer use cases