Adobe Firefly and Midjourney both turn a sentence into a picture. Past that, the documented difference is mechanical: Firefly keeps the machine-readable half of an instruction in a settings panel, and Midjourney requires it at the very end of one line.
A second difference is legal. Adobe ships a public API. Midjourney bans automated tools in its terms.
Everything below is quoted from each vendor’s own documentation, and we ran none of these prompts.
Two products behind one question
Adobe’s own community guide calls Firefly a studio that “provides access to several leading image generation models in a single interface.” Its model table lists Gemini 2.5 Flash Image (Nano Banana) and Gemini 3 (with Nano Banana Pro) beside Adobe’s own, so a Firefly comparison is really a comparison against a multi-model console.
Midjourney is the opposite shape: one company, one model line, switched with a parameter.
Neither vendor publishes a head-to-head page, so the mechanics below matter more than a style opinion.
How each tool receives a prompt
The two formats are not interchangeable.
Firefly: prompt plus panel settings
Adobe’s prompts page defines the input: “Prompts are instructions given to AI to perform a task or generate an output.” Everything you type is description. Shape lives in the panel — the aspect-ratio page names four choices inside General settings: Landscape (4:3), Portrait (3:4), Square (1:1) and Widescreen (16:9), plus one carve-out, because “Vertical (9:16) is available for Firefly Image 4 and Firefly Image 4 Ultra models.”
Midjourney: prompt plus parameters
Midjourney inverts this. “Parameters always go at the end of your text prompt, after you have described what you want to see,” its reference states, then adds three formatting rules and four wrong versions of one string, including vibrant California poppies--ar 2:3.
The ratio is typed, not chosen: --ar takes any numeric pair, the default is 1:1, and “--ar cannot contain decimals.”
Fixed menu on one side, arbitrary numeric pair on the other.
Worked examples: one prompt, two tools
Adobe’s prompts page publishes graded ladders, each rung adding a layer. Two of those strings follow in both delivery formats. We generated nothing; the Midjourney form obeys its documented placement rules.
Example A: the cat prompt
Adobe’s third rung, inside the Firefly delivery:
Firefly — Prompt field
Cat with bold stripes, digital painting, 2 colors, sitting by the window, shallow depth of field, cyberpunk fantasy.
Firefly — General settings
Aspect ratio: Widescreen (16:9)
Content type: ArtThe same words, delivered the Midjourney way, grow a tail after a space:
Cat with bold stripes, digital painting, 2 colors, sitting by the window, shallow depth of field, cyberpunk fantasy --ar 16:9The commas survive inside the description. Midjourney’s no-punctuation rule governs the parameter block, not the prompt text.
Example B: the clay-art prompt
Adobe’s longest rung carries an emotion word:
Firefly — Prompt field
Clay art, a little girl with a big smile wearing a raincoat standing in the rain with a backdrop of an iceberg.
Firefly — General settings
Aspect ratio: Square (1:1)
Content type: ArtAppending the ratio exposes a small trap:
Clay art, a little girl with a big smile wearing a raincoat standing in the rain with a backdrop of an iceberg --ar 1:1Midjourney’s aspect-ratio page says “the default aspect ratio is 1:1,” so that flag changes nothing there. In Firefly the same choice is worth making, because the panel remembers your last selection.
Side-by-side comparison
| Dimension | Adobe Firefly | Midjourney |
|---|---|---|
| Prompt text | Description only | Description, then a space, then parameters |
| Aspect ratio | Fixed menu of four, plus Vertical (9:16) | --ar #:#, default 1:1, decimals rejected |
| Parameter formatting | Not applicable, values are panel fields | Last, spaced, punctuation-free |
| Automation | Public API documented | Automated tools prohibited |
| Commercial framing | Trained on licensed material | You own all Assets You create |
| Revenue threshold | Not stated on the pages we read | Pro or Mega above $1,000,000 USD revenue a year |
| Billing unit | Credits on web, Operations on the API | Fast GPU hours per month |
Commercial use and automation rules
Adobe’s position concerns training data: Firefly models are “commercially safe, trained on content Adobe has permission to use,” and “content you create or upload to Firefly is not used to train Adobe’s AI models.” Partner models get a carve-out: “you are responsible for deciding if a partner model is right for your project.”
Midjourney’s position concerns ownership: “you own all Assets You create with the Services to the fullest extent possible under applicable law,” except that a company above $1,000,000 USD a year needs a Pro or Mega plan to own its assets. Outputs stay “publicly viewable and remixable” unless Stealth Mode is on, which the plans page limits to Pro and Mega.
Then the clause that decides bulk work: “You may not use automated tools to access, interact with, or generate Assets through the Services.” Adobe instead documents an official Firefly API with credentials, limits and a rate card.
What each vendor publishes about cost
Midjourney prices in GPU time. Four tiers — Basic $10, Standard $30, Pro $60, Mega $120 per month — carry Fast GPU time of 3.3 hr/month (200 minutes), 15 hr/month, 30 hr/month and 60 hr/month, with extra time at $4/hr.
Adobe meters per surface: web plans use generative credits, the API uses Operations, where one generated image is one Operation. Our pricing breakdown covers the consumer side and the Image 5 walkthrough the model itself.
What neither side publishes
Neither vendor publishes a per-image dollar figure you can multiply by volume: Adobe gives counts, Midjourney gives minutes. Neither publishes head-to-head quality data either, so any confident scoring you find is somebody’s own test rather than a vendor claim.
Frequently asked questions
Does Midjourney accept a plain sentence with no parameters? Yes. Parameters are optional and belong at the end only when you want them.
Can I set any aspect ratio in both? No. Midjourney takes an arbitrary numeric pair through --ar; Firefly offers a fixed menu and limits Vertical (9:16) to the Image 4 models.
Can I automate Midjourney the way I can automate Firefly? Its terms prohibit automated tools, so the two are not interchangeable for pipelines.
Does Firefly use only Adobe models? No. Partner models share the interface, and Adobe puts their terms on you.
Do both allow commercial use? Both address it, differently: Adobe speaks to training data, Midjourney to ownership plus a revenue threshold.
The tiebreaker is not which tool draws better. It is whether your instruction needs a panel, a parameter tail, or a service account.