FLUX and GPT Image: a spec comparison
FLUX and GPT Image make pictures from text and edit photos with references. GPT Image 2 and 2.5 take up to 16 photos, render 4K, and let you pick a custom frame size and a quality level. FLUX.2 takes up to 8 references at 1K or 2K and has no custom size, while Flux Kontext takes one picture for editing.
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FLUX and GPT Image specs side by side
| Parameter | FLUX | GPT Image |
|---|---|---|
| Developer | Black Forest Labs | OpenAI |
| Versions | FLUX.2, Flux Kontext | GPT Image 2.5 Flare, GPT Image 2.5 Sunburst, GPT Image 2, GPT Image 1.5, GPT-4o Image |
| Modes | text to image, edit from photos | text to image, edit from photos |
| Resolution | 1K, 2K | 1K, 2K, 4K, custom size |
| Aspect ratios | 1:1, 9:16, 16:9, 3:4, 4:3, 3:2, 2:3, 21:9, 9:21 | 1:1, 9:16, 16:9, 3:4, 4:3, 2:3, 3:2, 4:5, 5:4, 21:9 |
| References | up to 8 images | up to 16 images |
| Prompt | up to 5,000 characters | up to 32,000 characters |
| Price from | from 3 tokens | from 2 tokens |
When to use FLUX
- Editing one picture: Flux Kontext takes a single reference.
- The 9:21 format for a stretched frame: Flux Kontext gives it.
- When 4K is not needed: FLUX.2 works in 1K and 2K.
When to use GPT Image
- More references: up to 16 photos in GPT Image 2 and 2.5.
- 4K and a custom frame size: GPT Image 2 and 2.5 have both.
- Quality levels: three in GPT Image 2, five in version 2.5.
Model pages
Frequently asked questions
Where is 4K available?
In GPT Image 2 and 2.5. FLUX.2 renders 1K and 2K.
Which one takes more references?
GPT Image 2 and 2.5, up to 16 photos. FLUX.2 takes up to 8, and Flux Kontext takes one picture.
Which FLUX version suits editing?
Flux Kontext: one reference picture and the 9:21 format. FLUX.2 takes up to 8 references.
How much does each one cost?
The token price depends on the version and resolution. The generate button shows the exact amount before you start.
How do I know which one fits my task?
Run the same prompt in FLUX and GPT Image, then compare the result and the token cost. The run button shows the amount before you start.