4K used to be an upscale button. In 2026 it is a native output, and half the models in our image generator will render it directly. Native matters because upscaling invents texture after the fact, while a true 4K render decides detail during generation: fabric weave, text edges, distant signage all resolve in one pass.
Five models on Domer currently output 4K. They range from 12 to 25 credits per image, which is a wider spread than most people expect. Here is the comparison with real numbers, updated for October 2026.
The list at a glance
| Model | 4K cost | 2K cost | 1K cost | References | Notes |
|---|---|---|---|---|---|
| Flux 3 Klein | 12 credits | 8 | 5 | Up to 10 | Newest Flux, 9 ratios incl. 9:21 |
| GPT Image 2 | 12 credits | 8 | 5 | Up to 16 | Tied for cheapest 4K |
| Nano Banana 2.1 | 15 credits | 10 | 6 | Up to 10 | 14 ratios incl. 8:1 and 4:1 |
| Nano Banana Pro | 20 credits | 20 | 20 | Up to 8 | Flat price at any resolution |
| GPT Image 2.5 Flare / Sunburst | 25 credits | 16 | 10 | Up to 16 | Sunburst variant for dense detail |
All five are available in the text-to-image and image-to-image generators. Tier note: Flux 3 Klein, Nano Banana 2.1, and GPT Image 2.5 Flare are standard models whose 4K tier is paywalled; GPT Image 2, Nano Banana Pro, and Sunburst are premium models that need a paid plan for every resolution.
Flux 3 Klein: cheapest new 4K
FLUX 3 Klein is Black Forest Labs' latest, and it landed in October with the friendliest price on this list for a new model: 12 credits at 4K, 5 at 1K. It takes up to 10 reference images in edit mode and covers nine aspect ratios from 1:1 to 9:21.
The 9:21 ratio deserves a mention. It is a cinema format, and it is rare for a model to expose it natively rather than expecting you to crop.
Choose it when you want modern Flux rendering at the lowest 4K price and your compositions fit standard-to-cinematic frames.
GPT Image 2: the quiet value pick
GPT Image 2 matches Flux 3 Klein at 12 credits for 4K and quietly beats everything here on reference count: 16 images per edit. It has been in the catalog since September, so its quirks are well understood by now.
The tradeoff is aspect ratio. GPT Image 2 drops 1:1 at 4K and skips 5:4 and 4:5 entirely, because its 4K pipeline only supports specific frames. If your project needs a square 4K render, look elsewhere on this list.
Nano Banana 2.1: the format specialist
Google's Nano Banana 2.1 costs 15 credits at 4K and brings fourteen aspect ratios, the widest spread here. 8:1 for leaderboard banners, 4:1 for page headers, 1:4 for slim vertical strips. No other model comes close on format coverage.
It also edits with up to 10 references and has become the default daily driver for a lot of our users: good text rendering, fast turnaround, predictable pricing.
Nano Banana Pro: flat pricing, premium rendering
Nano Banana Pro is the odd one out: 20 credits whether you render 1K or 4K. At low resolutions that is expensive; at 4K it undercuts both GPT Image 2.5 variants. It is also the only premium-tier model here, so it requires a paid plan from the first image.
The rendering holds up at the top end, which is why it survives this list. If your work already lives at 2K and you occasionally jump to 4K, flat pricing removes one decision.
GPT Image 2.5 Flare and Sunburst: the ceiling
At 25 credits per 4K image, these are the most expensive options, and they earn it in specific situations. Flare is the fast variant. Sunburst renders slower with denser detail, and it is the model we reach for when a scene is genuinely packed: crowds, market stalls, layered machinery.
Both accept 16 reference images per edit, tying GPT Image 2 for the highest limit in the catalog. If your 4K work is reference-heavy, that limit matters more than the price gap.
What 4K actually costs in dollars
Credit value depends on your plan: pay-as-you-go packs work out to about 4 cents per credit, while the largest annual plan drops it near 1.1 cents. At those ends of the range:
- Flux 3 Klein 4K: roughly $0.50 per image on PayGo, $0.13 on the largest annual plan
- Nano Banana 2.1 4K: $0.63 to $0.17
- GPT Image 2.5 4K: $1.04 to $0.28
That spread is why we tell heavy users to compare models in credits first and convert later. The same render brief can cost double just by picking the wrong row. Current pack and plan prices are on the pricing page.
How to choose in one pass
- Need the cheapest 4K with modern quality: Flux 3 Klein or GPT Image 2, both 12 credits
- Need odd aspect formats at 4K: Nano Banana 2.1
- Need 16 references in one edit: GPT Image 2 or GPT Image 2.5
- Already at 2K, want 4K sometimes at flat cost: Nano Banana Pro
- Dense, layered, maximum-detail scene: GPT Image 2.5 Sunburst
FAQ
Which 4K AI image generator is cheapest on Domer?
Flux 3 Klein and GPT Image 2 tie at 12 credits per 4K image. Nano Banana 2.1 is close behind at 15.
Does higher resolution always mean better images?
No. Resolution adds detail capacity, not composition or lighting. A strong 2K render usually beats a weak 4K one. Render at 1K or 2K while iterating, then produce the final at 4K with a locked prompt and seed where the model supports one.
Can free users generate 4K images?
4K requires paid access on the standard-tier models here (Flux 3 Klein, Nano Banana 2.1, GPT Image 2.5 Flare). GPT Image 2, Nano Banana Pro, and Sunburst are premium models that need a paid plan at every resolution. Free accounts can generate at 1K on the standard ones.
Do these models upscale low-resolution inputs?
The editing modes work from the references you upload, but the output resolution is native to the generation, not a super-resolution pass. For best 4K results, feed references that are already sharp.
Where do I pick the resolution?
In the text-to-image or image-to-image generator, open the model picker, choose a model, and set resolution below the prompt box. 4K options show a crown and require a paid plan.
