MiniMax H3 Max: the prompt-adherence variant on Sume

fal lists MiniMax H3 Max as a post-trained variant of MiniMax H3 tuned for stronger prompt adherence. On Sume it is minimax-h3-max: text-to-video, start and end frame image-to-video, and reference-to-video at 480p, 768p or 1080p for 5 to 15 seconds, with native stereo audio. Whether it follows your prompt better than plain H3 is something to test on your own prompts.

The two descriptions

The first column is from fal's model explorer. The Sume column is from the Video Router and video generation docs. The two sources describe the model differently, one by tuning and one by speed, so neither tells you the whole story.

Call it on Sume

Billing is provider list times 1.25 like every Sume video model, and the catalog carries the numbers. The model reports image, video and audio supported_input_references. The call below is text-to-video at 768p on the Video Router route, which Sume says stays available; new integrations are pointed to POST /v1/videos, where the same model id works.

curl -X POST https://api.sume.com/v1/video-router/generate \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: h3-max-001" \
  -d '{
    "model": "minimax-h3-max",
    "prompt": "A slow dolly-in on a copper kettle as steam rises, morning light",
    "resolution": "768p",
    "duration": 8,
    "aspect_ratio": "16:9",
    "mode": "async"
  }'

A fair prompt-adherence test

• Write five prompts with three concrete, checkable details each (object, motion, light).
• Run each on minimax-h3 and minimax-h3-max at the same resolution and duration.
• Score each clip by counting how many of the three details appear.
• Read capabilities from GET /v1/video-router/models rather than assuming one envelope.