Midjourney Permutations and Multi-Prompts: Generate Multiple Variations from One Prompt

Most people building Midjourney prompts test variations the slow way - write a prompt, generate, tweak one word, generate again, repeat. If you're comparing five jacket colors or three lighting styles, that's five or ten separate submissions for what's really one underlying idea with a few swapped-out values. Midjourney has a built-in feature for exactly this, and almost nobody outside power-user circles knows it exists: curly-bracket permutations.

This guide covers permutations in full, plus the separate but related :: multi-prompt syntax, which gets confused with permutations constantly despite doing something entirely different.

What are Midjourney permutations

A permutation is Midjourney's way of generating multiple jobs from a single prompt line by listing several options for one part of the prompt inside curly brackets. The syntax is {option1, option2, option3} - a comma-separated list wrapped in braces, dropped directly into the spot in your prompt where that variable belongs.

When Midjourney parses a prompt containing curly brackets, it doesn't blend the options together or pick one at random. It generates a completely separate job for every option in the list - each one otherwise identical to the rest of the prompt, differing only in the value that came from the brackets. Three options in one bracket set means three separate jobs submitted at once.

This is fundamentally a testing and iteration feature. Instead of manually rewriting and resubmitting a prompt for every variation you want to compare, permutations let you queue all of them in a single submission and compare the results side by side.

How to use curly brackets in Midjourney

Here's the basic workflow, worked through with a canonical example - testing three jacket colors in one prompt:

1. Write your base prompt as normal, identifying the one element you want to test multiple versions of - in this case, jacket color.
2. Replace that single value with a curly-bracket list of the options you want to compare, separated by commas.
3. Submit the prompt once. Midjourney parses the brackets and generates one job per option automatically.
4. Review each job independently - they'll arrive as separate generations, not one blended image.

The same pattern works for any variable, not just color - lighting style, camera angle, material, mood word, or setting. Anywhere you'd normally have to choose one value and commit, curly brackets let you test several at once instead.

How many permutations can Midjourney run at once

Midjourney limits how many jobs a single permutation prompt can generate, and that limit depends on two things: your subscription plan and your generation mode (Fast vs. Relax). Higher-tier plans and Fast mode generally allow a larger number of simultaneous permutation jobs than Basic plans or Relax mode.

Because Midjourney adjusts these limits periodically as the platform evolves, treat any specific number you see quoted elsewhere as approximate and subject to change rather than a fixed rule. If you're planning a permutation prompt with a large number of combinations, the safest approach is to check docs.midjourney.com or run the /info command in Discord to see your account's current exact job limit before submitting - if you exceed the cap, Midjourney will typically reject the prompt or ask you to reduce the option count rather than silently truncating your list.

Practically, this means permutations are best used for small, deliberate comparisons - three to five options on one variable - rather than trying to brute-force dozens of combinations in a single submission.

Nested permutations for combinatorial testing

Curly brackets aren't limited to one set per prompt. You can include multiple bracket sets in the same prompt line, and Midjourney generates a job for every combination across all of them - not just the sum of each set's options.

For example, testing both jacket color and lighting style at once, with three options each, produces nine jobs total (three colors × three lighting styles), not six. Every combination gets its own job:

Nesting is powerful for genuinely combinatorial testing, like comparing color and lighting together instead of one variable at a time. But the job count multiplies quickly - two variables with four options each already produces sixteen jobs. Keep your plan's job-count limit in mind before nesting more than two bracket sets in one prompt.

What are multi-prompts (::)

Multi-prompts are a completely separate feature from permutations, even though both use punctuation most people have never touched. The :: double-colon syntax splits a single prompt into distinct segments that Midjourney treats as separate concepts, rather than reading the whole line as one continuous phrase.

The canonical example is hot:: dog. Written normally as "hot dog," Midjourney reads it as one familiar concept - the food. Written as hot:: dog, Midjourney instead treats "hot" and "dog" as two separate ideas to blend into the image, which can produce a genuinely different result - something closer to a dog that is hot, or visual elements of both concepts combined rather than the single compound noun.

The formatting convention matters here: Midjourney's documented syntax is a space before the double colon, with no space required after it - hot:: dog, not hot ::dog or hot::dog. You can split a prompt into more than two segments the same way, adding additional :: dividers wherever you want Midjourney to treat the next phrase as a separate concept.

This split-only mechanic - dividing a prompt into separate concepts - is the core of what multi-prompts do. Midjourney also supports numeric weighting with ::, using a number after the double colon (like hot::2 dog) to control how strongly each segment is emphasized relative to the others. That's a more advanced technique with its own set of rules around decimal and negative weights - see our complete guide to prompt weighting syntax for the full breakdown. For now, this guide covers the split mechanic on its own, since understanding how :: divides concepts is the foundation you need before adding weight control on top of it.

Combining permutations with multi-prompts

Because permutations and multi-prompts operate on different parts of the pipeline - one multiplies jobs, the other restructures a single job's prompt - they can be combined in the same prompt line. A permutation bracket can sit inside one segment of a multi-prompt, or vice versa.

This kind of combination is useful when you want to compare variations (permutations) while also making sure Midjourney doesn't blur two distinct ideas into an unintended compound concept (multi-prompts). They solve different problems, and using them together is often more effective than relying on either one alone.

Batch-test your variations automatically

Building a permutation prompt by hand means manually formatting curly brackets, keeping track of your job-count limit, and remembering the space-before-:: formatting rule for multi-prompts. It's easy to get the syntax slightly wrong, especially when nesting multiple bracket sets.

The free Midjourney Prompt Builder walks you through the full 6-layer prompt framework and helps you structure comparison-ready prompts correctly the first time, so you're not debugging curly-bracket syntax by trial and error inside Discord.