MiniMax H3 text-to-video rejects adaptive: send an explicit ratio
On Sume the H3 text-to-video builder accepts 21:9, 16:9, 4:3, 1:1, 3:4 or 9:16 and rejects adaptive. Only reference-to-video allows it. Preflight in Python.
Wan 3.0 and Seedance accept auto or adaptive. If you reuse that payload on MiniMax H3 for text-to-video, the Sume builder returns the message "aspect_ratio must be 21:9, 16:9, 4:3, 1:1, 3:4, or 9:16." I read this in the repo on 2026-10-07 and have not recorded the HTTP status code, so catch any 4xx rather than one code.
Where adaptive works
| Mode | adaptive | Notes |
|---|---|---|
| H3 text-to-video | rejected | send one of six ratios |
| H3 image-to-video | not sent | ratio follows the image |
| H3 reference-to-video | allowed | up to 9 images, 3 videos, 3 audios |
| Wan 3.0 | auto and adaptive accepted | both sent as adaptive |
A small preflight that fixes the payload before you pay for a job:
ALLOWED = {"21:9", "16:9", "4:3", "1:1", "3:4", "9:16"}
def h3_text_ratio(value, fallback="16:9"):
if value in ALLOWED:
return value
return fallback
for v in ("adaptive", "auto", "9:16", None):
print(v, "->", h3_text_ratio(v))Sources
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