FLUX.2 [pro] vs GPT Image 1.5
Black Forest Labs's FLUX.2 [pro] and OpenAI's GPT Image 1.5 both target image generation, but they price and behave differently. Here is the side-by-side.
Pricing checked against provider documentation on . How we verify
The short answer
FLUX.2 [pro] is the cheaper option — roughly 1.4x less on a blended workload, and it suits cheapest flagship-tier image quality. GPT Image 1.5 justifies its premium when you need complex multi-subject composition.
Black Forest Labs • FLUX.2
$0.03 / $
/ image (input / output)
The best quality-per-dollar in hosted image generation, at three cents for a 1024² render through the official API, fal.ai, or Replicate alike. Note that Replicate prices by megapixel, so feeding in reference images for an edit pushes a single call closer to $0.055.
OpenAI • GPT Image
$0.04 / $
/ image (input / output)
The strongest current model for scenes with many interacting elements — independent testing puts it ahead of the FLUX line on photorealism and well ahead on compositions involving eight or more subjects. Latency is around five seconds, so it is a considered choice rather than an interactive one.
Input price
GPT Image 1.5 is 40% more expensive than FLUX.2 [pro] on input tokens.
Specification comparison
| Attribute | FLUX.2 [pro] | GPT Image 1.5 |
|---|---|---|
| Input (/ image) | $0.03 | $0.04 |
| Output (/ image) | — | — |
| Cached input | — | — |
| Context window | — | — |
| Max output | — | — |
| Native reasoning | No | No |
| Knowledge cutoff | — | — |
| Relative latency | low | medium |
| Open weights | No | No |
| API model ID | flux-2-pro | gpt-image-1.5 |
| Status | stable | stable |
FLUX.2 [pro]: 1024² generation. The [pro] tier is API-only; FLUX's smaller schnell and dev variants are the openly downloadable ones.
GPT Image 1.5: Medium quality at 1024px. High quality is reported between $0.13 and $0.17 per image and sources disagree on the exact figure — confirm in the console before budgeting. A cheaper Mini variant runs about $0.036 at high quality.
Choose FLUX.2 [pro] if…
- Production creative at volume
- Image-to-image editing
- E-commerce and catalogue art
- Design exploration
Choose GPT Image 1.5 if…
- Complex photorealistic scenes
- Multi-subject compositions
- Editorial and hero imagery
- Iterative image editing
Frequently asked
Is FLUX.2 [pro] or GPT Image 1.5 cheaper?
FLUX.2 [pro] is cheaper. On a blended 3:1 input-to-output workload it costs about 1.4x less than GPT Image 1.5.
Which has the larger context window, FLUX.2 [pro] or GPT Image 1.5?
Both accept up to — tokens, so context is not a differentiator here.
Should I use FLUX.2 [pro] or GPT Image 1.5?
Pick FLUX.2 [pro] for cheapest flagship-tier image quality. Pick GPT Image 1.5 for complex multi-subject composition. If cost dominates the decision, FLUX.2 [pro] wins; if you need the capability ceiling, benchmark both on your own evals before committing.