Pricing checked October 30, 2026
Kling 4.0 API pricing
fal lists text-to-video pricing at $0.157 per second for 720p and $0.235 for 1080p. The calculator currently estimates its text-to-video endpoint.
Runway lists 15.7 credits per second at 720p and 23.5 at 1080p without input video, at $0.01 per credit. Through November 30, 2026 UTC, Runway rounds the list charge up to a whole credit, applies a 20% discount, then rounds up again. Its example for five seconds at 720p is 64 credits ($0.64).
Runway video-to-video uses the input video length as the output duration. Its billing rate for input video is 9.4 credits per second at 720p or 14.1 at 1080p, applied to the output duration plus the greater of input and output duration, before rounding and the temporary discount. Input video is capped at 30 seconds.
For text and image generations, enter the combined duration of any video references in the calculator. Confirm the provider’s current rates and input rules before generating.