GPT-Image 1.5 vs Z-Image Turbo

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
GPT-Image 1.5 Better photorealism, Better text rendering
Z-Image Turbo Faster generation
Winner Score 10-0 (GPT-Image)
Avg Speed GPT-Image: 40.0s
Avg Speed Z-Image: 1.5s
Best at Text GPT-Image
Best at Photos GPT-Image

Specs

What each model can do.

Feature GPT-Image 1.5 Z-Image Turbo
Text-to-Image Yes Yes
Image-to-Image Yes No
Max Resolution 1K (1024×1024) 4K (4096×4096)
Average Speed 40.0s 1.5s
Cost via fal.ai
$0.009–$0.20
low–high quality
$0.005
per megapixel
Architecture Multimodal LLM Diffusion (Turbo)
Providers fal.ai, OpenAI fal.ai

Use both models in VM Studio

Install VM Studio and compare GPT-Image 1.5 vs Z-Image Turbo on your own prompts.

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