What your credits actually buy

Runway (credits at $0.01 on API)

Model	Credits / second	100 credits buys	625 (Standard plan)	2,250 (Pro)
Gen-4.5	25	4 s	25 s	90 s
Gen-4	12	~8 s	~52 s	~187 s
Gen-4 Turbo	5	20 s	125 s	450 s

Kling (Standard plan: $6.99 / 660 credits)

Generation	Credits	660 credits buys	Effective rate
5s standard mode	20	33 clips (165 s)	~$0.042/s
10s standard 1080p	~40–60	11–16 clips	~$0.06–0.10/s
Pro mode	2–3× standard	varies	~$0.08–0.13/s

Rates shown at each model's base tier, verified July 2026 from official vendor pricing pages and documentation. Vendors change prices without notice — see methodology.

The only two numbers to remember

For any credit platform: (1) what does one credit cost me — plan fee ÷ included credits — and (2) how many credits does one second burn at my mode and resolution. Multiply, and every marketing veil drops. If either number takes more than two minutes to find in a vendor's docs, treat that as pricing information too. The why behind the veils: why tools use credits.

Run your own numbers. The cost calculator applies your clip length, resolution and a realistic retake buffer across every model at once.