Two of 2026's leading AI video models, compared on what actually matters: price per second, audio, output quality and the jobs each one wins. Based on the same public pricing data as our cost calculator.
| Kling 3.0 | Runway Gen-4.5 | |
|---|---|---|
| Maker | Kuaishou | Runway |
| 720p $/sec | $0.04 | $0.12 |
| 1080p $/sec | $0.08 | $0.24 |
| Native audio | ✘ None | ✘ None |
| Best at | Best price-to-quality ratio, human motion | Editor integration, video-to-video, pro workflows |
| Watch out | No native audio; watermark on free tier | Audio needs a separate pass; credit system |
Approximate public list prices as of August 2026. Run your exact clip length through the cost calculator — and remember the retry tax: real cost ≈ list × 3.
Volume generation on a budget. Kling's human motion (walking, dancing, sports) is close to flagship quality at a fifth of the price. If your pipeline is generate-download-edit elsewhere, Kling is the rational default.
Professionals living inside an editor. Runway's video-to-video, motion brush and timeline tools mean you fix shots instead of re-rolling them. Gen-4 Turbo at $0.05 is also a fine draft tier — draft and final in one ecosystem.
Solo creator optimizing cost per clip: Kling, no contest. Team or editor-centric workflow where iteration speed beats unit price: Runway justifies its premium.
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Full 10-model landscape: AI Video Model Comparison. Prompt formats differ per model too — grab ready examples in the prompt libraries.
Once your clip is made, check the packaging with the YouTube title analyzer.
Kling 3.0 is the price-performance king at $0.08/sec for 1080p. Runway costs 3× more but comes with a real editing suite — you're buying a workflow, not just a model.
Neither ships native audio — both output silent video. Budget a voiceover pass (ElevenLabs or similar) either way, so audio shouldn't decide this matchup.