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Guides, deep dives, and insights on AI video generation.

9 articles in Model GuideClear filters

Veo 3.1: 4K, Native Audio, and the $0.40/sec Cost Math

Veo 3.1 is the only video model on fal.ai that ships 4K and synthesized audio together, but at $0.40/sec an 8-second 4K clip costs $3.20.

Veo 3.1 Lite costs $0.05/sec instead of $0.40/sec - an 8x price cut that drops 4K and keeps native audio.

Seedance 2.0 bills at $0.014 per unit, not per second - and it's the only model on fal.ai that supports native 21:9 ultrawide output.

Wan 2.7 charges the same $0.10 per second whether you render at 720p or 1080p, which flips the usual resolution-cost tradeoff on its head.

Kling v3 Pro is the only model on fal.ai with first-class multi-shot scripting (multi_prompt) and character consistency bindings (elements).

Grok Imagine Video outputs silent clips at 720p for $0.05/sec - no audio, no negative prompt, no seed. The parameter surface is deliberately minimal.