Which should you choose?
Pick Runway Gen-4 Turbo for production workflows and predictable api billing. Pick Kling 2.5 Turbo Pro for quality-conscious generation at a midrange price. Use the same prompt brief, aspect ratio and acceptance rubric across both.
Cost at production volume
At 1,000 ten-second generations, Runway Gen-4 Turbo is about $500 and Kling 2.5 Turbo Pro is about $700, before retries and ancillary fees.
Method
We prioritize first-party API pricing and explicitly label resolution and audio. Speed descriptions are directional unless the provider publishes a repeatable benchmark.