Negative prompts, and when they do nothing
Not every model on minsuro uses a negative prompt. Knowing that saves you from debugging a field that is being ignored.
What a negative prompt is
A negative prompt is a second list of concepts that the model steers away from while it renders. It is not a filter applied afterwards and it is not a guarantee. It biases the result, in the same way the main prompt does, just in the opposite direction.
Not every model listens to it
This is the part that surprises people. The studio shows one negative prompt field for every model, but many models simply do not use one. On those, the text has no effect on the result, and nothing in the render tells you it was ignored.
- If a negative prompt seems to change nothing, assume the model is ignoring it before you assume your wording is wrong.
- Test it the quick way: run the same prompt with and without the negative and compare.
- When it matters, move the instruction into the main prompt, which every model reads.
Writing one that helps
On the models that do support it, keep the negative short and concrete. A fifty-item list of every failure mode you have ever seen will flatten the image, because you are pushing the model away from a large and vaguely defined region at once.
Weathered lighthouse on a basalt cliff, storm rolling in, spray catching the last light, moody oil painting
blurry, low contrast, watermark, text, extra hands
Five specific terms. Add more only when you have seen the failure it targets.
Worth remembering
- Many models ignore the negative prompt entirely, with no warning in the result.
- If a negative seems to do nothing, test with and without it before rewording.
- Keep negatives to a handful of concrete terms, and prefer stating the positive instead.