FLUX.2 Klein 9B vs GPT-Image 1.5

We ran both models through 10 prompts and measured the results. Below you'll find the actual outputs, generation times, and our notes on each.

Quick Verdict
10 prompts tested Jan 2026
FLUX.2 Klein 9B Faster generation, Better photorealism
GPT-Image 1.5 Better text rendering
Winner Score 2-8 (GPT-Image)
Avg Speed FLUX.2 Klein: 1.5s
Avg Speed GPT-Image: 40.0s
Best at Text GPT-Image
Best at Photos FLUX.2 Klein

Specs

What each model can do.

Feature FLUX.2 Klein 9B GPT-Image 1.5
Text-to-Image Yes Yes
Image-to-Image Yes Yes
Max Resolution 1K (1024×1024) 1K (1024×1024)
Average Speed 1.5s 40.0s
Cost via fal.ai
$0.011
per megapixel
$0.009–$0.20
low–high quality
Architecture Diffusion (Klein) Multimodal LLM
Providers fal.ai fal.ai, OpenAI

Use both models in VM Studio

Install VM Studio and compare FLUX.2 Klein 9B vs GPT-Image 1.5 on your own prompts.

Add to Figma