Best AI video model for lip-synced dialogue clips on Sume

For a clip where the mouth matches the words, Sume gives you three routes. gemini-omni-flash-1.1 generates synced audio with the clip (3 to 10 seconds); the docs make no per-language speech-quality claim, so test your line. H3 Max Lip Sync takes a still image plus your audio file. The avatar route covers longer talking-head work, up to 60 seconds per job. Which one depends on whether you already have the voice.

The three routes

Limits for the Lip Sync route come from the Sume models index and API doc.

Choosing

If you need a specific voice or a script read by a given speaker, use your own audio with the Lip Sync route. If you only need a plausible spoken line, Omni is the shortest path. For dialogue longer than 10 seconds, use the avatar route (4-60 s per job) rather than stitching 10-second clips.