Best for
Models where the pricing page or the vendor reference says audio is part of the generation, not a separate mix.
Alibaba · Model
Alibaba's HappyHorse video model. Runway Dev prices 720p and 1080p. Alibaba's API reference lists duration and aspect ratio, including 9:16.
Kuaishou · Model
Kling 4.0 on Runway Dev, with audio always on. The standing list rate is 15.7 credits/s at 720p and 23.5 at 1080p. A separate 20% promo through 30 November 2026 UTC is not the standing price.
Google DeepMind · Model
Google Veo 3.1 on Runway Dev, with a higher rate when audio is on. The table does not attach those rates to a resolution.
Kuaishou · Model
Kling 3.0 on Runway Dev, with separate per-second rates when audio is off and on. Resolution is not stated on that table.
Google DeepMind · Model
The fast Veo 3.1 tier on Runway Dev. Audio and no-audio rates are both published, without a resolution label.
Kuaishou · Model
Kling 3.0's 4K tier on Runway Dev. The page says the rate does not change when audio is toggled.