MiniMax H3 Text to Video

MiniMax H3 is the current head of the Hailuo line, and this is its plainest mode: prompt in, video out. No reference frames, no audio conditioning - just a text box, a resolution, a ratio, a duration, and a finished clip that comes back from MiniMax's servers. If you've used the older Minimax Hailuo nodes and wanted the new model, this is that upgrade.

It's a partner node - the generation happens in MiniMax's cloud through Comfy's proxy, billed per second through your Comfy account, and it shipped in ComfyUI core in late July 2026. H3's pitch over the older Hailuo releases is better prompt adherence, stronger motion, and proper 2K output, which is a big deal for a hosted tier that previously topped out lower.

How it works

The node builds a generation request - model, prompt, resolution, ratio, duration, seed, watermark - submits it to MiniMax's video_generation API, and polls the task until the video is ready. Almost everything interesting lives inside the model dropdown, which is a dynamic combo hiding four real settings:

• prompt - the actual text brief, inside the dropdown.
• resolution - 768P or 2K. 2K is the quality setting and costs more per second.
• ratio - aspect ratio: adaptive, or 16:9, 4:3, 1:1, 3:4, 9:16, 21:9.
• duration - a slider from 4 to 15 seconds.

Outside the dropdown you get seed (a real seed this time - same seed gives similar, not guaranteed identical, results) and watermark, which toggles an AIGC watermark on the output. It's off by default.

The inputs that matter

The model dropdown is the node. Everything else is seed and watermark. Resolution and ratio are where the per-second price moves, and the badge on the node tracks it.

Output is a single VIDEO.

Gotchas

People who jump straight from the older Hailuo nodes miss that the prompt now lives inside the model combo - the node looks empty until you open the dropdown. The seed is genuinely sent to MiniMax, unlike some partner nodes, but "similar, not guaranteed identical" means you still can't treat it as a reproducibility guarantee; for that, MiniMax has dedicated regenerate and first-last-frame nodes. And 2K at 15 seconds is the expensive corner - it's real money per render, so draft at 768P and reserve 2K for the take you're keeping.