Luma UNI-1 Max: AI Image Editor Online
Bottom line
Luma UNI-1 Max is Luma AI's multi-reference image editor: up to 8 images and a 3,000-character instruction in, one large image out, 14 credits at the 1K setting or 20 at 2K. Open the Image Edit tool, select Luma UNI-1 Max, upload your image, and the exact credit cost appears before the edit runs.
Luma UNI-1 Max is Luma AI's image model, and on VdoBloom it is an editor: you upload up to 8 reference images, describe what to make from them in up to 3,000 characters, and get one combined or edited image back. It costs 14 credits with the 1K setting and 20 with the 2K setting. It suits jobs that need several sources in one frame, such as a product in a styled scene, a person in a new outfit and location, or a subject restyled from a second image's look. There is no text-only mode on VdoBloom; it needs at least one image.
The output size is fixed by the aspect ratio you pick, because Luma accepts only set sizes: 2048x2048 for 1:1, 2784x1504 for 16:9, 1504x2784 for 9:16, and so on (full table below). One detail worth knowing before you pay for 2K: in VdoBloom's current integration, the request sent to Luma uses that same preset size for both settings. The 1K/2K choice changes the credit price, not the size asked for, so 1K is the sensible default.
The 10 free signup credits fall 4 short of one edit. A one-time 300-credit pack is $19.50 and never expires (21 edits at 14 credits), or Lite is $15 a month for 300 credits that reset each cycle. Below are the specs, sizes, worked costs, a comparison with Seedream 5.0 Pro, GPT Image 2 and other editors, prompting notes and limits, checked against VdoBloom's configuration in October 2026.
Luma UNI-1 Max specs at a glance
These are the limits VdoBloom's code enforces for this model. The most common surprise is the size: every aspect ratio produces a file of more than 2,000 pixels on its long side, whichever resolution setting you pick.
| Spec | Luma UNI-1 Max on VdoBloom |
|---|---|
| Maker | Luma AI (the lab behind the Ray and Dream Machine video models) |
| Mode | Image editing from references; at least one image is required |
| Reference images | 1 to 8; uploading more than 8 is rejected with an error before any credits are used |
| Prompt length | Up to 3,000 characters |
| Aspect ratios | 7: 1:1, 16:9, 9:16, 4:3, 3:4, 3:2, 2:3 |
| Output size | One fixed size per aspect ratio, 2048x2048 to 2912x1440 (table below) |
| Resolution setting | 1K or 2K; sets the price (14 or 20 credits); the size requested is the same preset for both |
| Output | One image per run |
| Price | 14 credits (1K setting), 20 credits (2K setting) |
| Content filter | Moderate, VdoBloom's middle tier |
| Where it runs | Images > Edit (Image Edit tool) |
Output sizes by aspect ratio
Luma's API accepts only these width and height pairs and rejects any other, so VdoBloom maps each aspect ratio in the picker to one of them. Choose the ratio before you write the prompt: you cannot crop back to a different shape later without losing pixels.
| Aspect ratio | Size sent to Luma | Megapixels | Typical use |
|---|---|---|---|
| 1:1 | 2048 x 2048 | 4.2 | Catalogue tiles, profile art, square posts |
| 16:9 | 2784 x 1504 | 4.2 | Website heroes, video thumbnails |
| 9:16 | 1504 x 2784 | 4.2 | Story and reel frames |
| 4:3 | 2464 x 1696 | 4.2 | Slides, editorial images |
| 3:4 | 1696 x 2464 | 4.2 | Portraits, lookbook pages |
| 3:2 | 2912 x 1440 | 4.2 | Wide photographic crops |
| 2:3 | 1440 x 2912 | 4.2 | Posters, tall portraits |
What Luma UNI-1 Max costs: worked examples
The price depends only on the resolution setting: 14 credits at 1K, 20 at 2K, with any number of references from 1 to 8 and any aspect ratio. Dollar figures use the Lite plan rate of $0.05 a credit; the one-time 300-credit pack is $19.50 and never expires. Since the requested size is the same preset at both settings in the current integration, the examples assume the 1K setting.
| Job | Credits | At $0.05 a credit |
|---|---|---|
| 1 edit, 1K setting, 1 to 8 references | 14 | $0.70 |
| 1 edit, 2K setting | 20 | $1.00 |
| 4 attempts at one composite (1K setting) | 56 | $2.80 |
| Same scene in 9:16 and 16:9 (2 runs, 1K setting) | 28 | $1.40 |
| Edits from one 300-credit pack | 21 at 1K (294 credits) or 15 at 2K | $19.50 one-time |
Read more: How to use Luma UNI-1 Max · Credit packs and plans
Luma UNI-1 Max vs Seedream 5.0 Pro, GPT Image 2 and other editors
Every model below works in VdoBloom's Image Edit tool and accepts several reference images. They differ in how many images they take, how you set the size, what they cost and how strictly they filter content. Prices are VdoBloom credits per edit.
| Model | Credits per edit | Reference images | Aspect ratios | Resolution options | Content filter |
|---|---|---|---|---|---|
| Luma UNI-1 Max | 14 (1K), 20 (2K) | Up to 8 | 7 | 1K / 2K setting; fixed preset size per ratio | Moderate |
| Seedream 5.0 Pro | 10 (Standard), 19 (High) | Up to 10 | 5 | Standard (about 1K) / High (about 2K) | Flexible |
| GPT Image 2 | 3 (1K), 5 (2K), 8 (4K) | Up to 10 | 11 including auto | 1K / 2K / 4K | Strict |
| Nano Banana 2 | 15 at any resolution | Up to 14 | 15 including auto | 1K / 2K / 4K | Strict |
| Kling IMAGE O1 | 14 | Up to 10 | 8 | 1K / 2K | Moderate |
| P-Image-Edit | 6 | Up to 10 | 7 | Single setting | Moderate |
Read more: Seedream 5.0 Pro · GPT Image 2 (edit) · Nano Banana 2 · Kling IMAGE O1 · P-Image-Edit
Which editor to pick
Read the table as a set of trade-offs rather than a ranking. VdoBloom does not score these models on quality, so the choice comes down to what the job needs.
- Luma UNI-1 Max: you want a large file at a fixed shape from several references, with the Moderate filter, and 8 images are enough.
- Seedream 5.0 Pro: you want up to 10 references, the Flexible filter, and a cheaper Standard tier at 10 credits.
- GPT Image 2: you want the lowest price per edit (3 credits at 1K) or a 4K file, and your content fits a Strict filter.
- Nano Banana 2: you need more than 10 references (up to 14), extreme panoramic shapes such as 8:1, or 4K at a flat 15 credits, within a Strict filter.
- Kling IMAGE O1: same 14-credit price as UNI-1 Max at 1K, with up to 10 references and a 21:9 option.
- P-Image-Edit: you are iterating fast and cheaply at 6 credits an edit.
Where to run Luma UNI-1 Max on VdoBloom
Luma UNI-1 Max is in the image editor only.
- Images > Edit: choose Luma UNI-1 Max, upload 1 to 8 images in the order you will refer to them, write the instruction, pick the aspect ratio and the 1K or 2K setting, check the credit cost and run.
- No source image yet: generate a base first in Images > Generate, then upload it as reference 1.
- After the edit: the result can go back into the editor as a new reference, to the upscaler, or into Image to Video as a first frame.
Prompting Luma UNI-1 Max
Refer to your references by position: the person from the first image, the jacket from the second image, the room from the third image. Upload them in that order, with the image that carries the identity or the product first. Vague prompts tend to average several references together; specific ones tell the model which part to take from each.
Say what must not change in one plain sentence, for example: keep the face, the bottle label text and the logo placement exactly as in the references. Then describe the light and the camera rather than only the scene: soft window light from the left, shallow depth of field, eye-level shot. Pick the aspect ratio first, because the output size is fixed by it. The 3,000-character limit leaves room for detail, but a focused 60 to 150 word instruction is usually easier for the model to follow than a long one.
Limits and honest caveats
UNI-1 Max needs at least one image; there is no text-only mode on VdoBloom. It takes up to 8 references, fewer than Seedream 5.0 Pro, GPT Image 2 or Nano Banana 2 accept there. It offers 7 aspect ratios, with no 21:9 or panoramic shapes. It does not go to 4K. The output size is a fixed preset per ratio, and in the current integration the 2K setting costs 6 credits more without changing the size requested, so the 1K setting is the better buy. Each run returns one image. The prompt is cut at 3,000 characters. If a reference shows a real person, you need their consent. The 10 signup credits do not cover one edit.
VdoBloom does not grade editors on quality. A 14-credit run with your actual references answers whether UNI-1 Max suits the job faster than any review.
What creators use Luma UNI-1 Max for
- Product placement: a packshot from image 1 placed in the room from image 2, with the label kept.
- Outfit and location swaps: the person from image 1 wearing the jacket from image 2, standing in the street from image 3.
- Style transfer with an identity anchor: keep the subject from one image and take the palette or grade from another.
- Campaign frames at fixed sizes: 1504x2784 story frames, 2784x1504 web heroes, 2048x2048 catalogue tiles.
- Mood-board merging: up to 8 references reconciled into one composed image for a pitch.
How to use Luma UNI-1 Max on VdoBloom
- 1Open the Image Edit tool and select Luma UNI-1 Max.
- 2Upload the image(s) to edit and describe the change you want.
- 3Review the credit cost and generate. Results appear in your library.
Frequently asked questions
What is Luma UNI-1 Max?
UNI-1 is Luma AI's image model line, and UNI-1 Max is the version VdoBloom runs. On VdoBloom it is an editor: upload up to 8 reference images, write an instruction, and it returns one combined or edited image. Luma AI also makes the Ray and Dream Machine video models.
How much does Luma UNI-1 Max cost?
14 credits with the 1K setting and 20 with the 2K setting, whatever the number of references (1 to 8) or the aspect ratio. That is $0.70 or $1.00 at the Lite rate of $0.05 a credit.
Is there a difference between the 1K and 2K settings?
In VdoBloom's current integration, the request sent to Luma uses the same preset size for both, such as 2048x2048 for 1:1 or 1504x2784 for 9:16. The setting changes the price (14 or 20 credits), not the size requested, so the 1K setting is the sensible default.
How many reference images can I use?
Up to 8 per edit. If you upload more, VdoBloom rejects the request with an error before any credits are taken. Upload them in the order you refer to them in the prompt.
What sizes does Luma UNI-1 Max output?
One fixed size per aspect ratio: 2048x2048 (1:1), 2784x1504 (16:9), 1504x2784 (9:16), 2464x1696 (4:3), 1696x2464 (3:4), 2912x1440 (3:2) and 1440x2912 (2:3). Luma's API accepts only these pairs.
Can Luma UNI-1 Max generate an image from text alone?
Not on VdoBloom. It runs in the Image Edit tool and needs at least one uploaded image. Generate a base in Images > Generate first, then use it as reference 1.
Luma UNI-1 Max vs Seedream 5.0 Pro: which should I use?
Seedream 5.0 Pro takes up to 10 references, has a cheaper Standard tier (10 credits; High is 19) and carries the Flexible filter. Luma UNI-1 Max takes up to 8, costs 14 credits at the 1K setting and gives a fixed large file of about 4.2 megapixels at every ratio, with the Moderate filter.
Luma UNI-1 Max vs GPT Image 2: which should I use?
GPT Image 2 edits cost 3, 5 or 8 credits at 1K, 2K or 4K, accept up to 10 images and offer 11 aspect ratios, under a Strict content filter. Luma UNI-1 Max costs more per edit and stops below 4K, but carries the Moderate filter, which declines fewer everyday edits than a Strict one.
Is Luma UNI-1 Max free to try?
Not on the signup credits alone: new accounts get 10 free credits and one edit is 14. A one-time 300-credit pack is $19.50, never expires and covers 21 edits at the 1K setting.
How strict is the content filter?
Moderate, VdoBloom's middle tier: looser than the Strict filter on GPT Image 2 and the Nano Banana models, tighter than the Flexible tier. Platform content rules apply, and real people in references need their consent.
Luma UNI-1 Max guides, prices and comparisons
This page is the Luma UNI-1 Max hub. Each guide below goes deeper on one question and links back here.
How to use Luma UNI-1 Max
Practical guide: reference order, sizes, prompting and a worked example.
AI image editor from a photo
Which editor to use for which photo edit, UNI-1 Max included.
Merge two photos into one
How multi-image editing combines a subject and a scene.
How to use P-Image-Edit
The 6-credit multi-image editor, and when to step up to UNI-1 Max.
Best Luma Dream Machine alternatives
Luma's video and image models in context, with UNI-1 Max on VdoBloom.
Best AI image models in 2026
Every image model VdoBloom runs, grouped by job.