Nano Banana Pro 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
Nano Banana Pro Faster generation, Better photorealism
GPT-Image 1.5 Better text rendering
Winner Score 4-6 (GPT-Image)
Avg Speed Nano Banana: 18.6s
Avg Speed GPT-Image: 40.0s
Best at Text GPT-Image
Best at Photos Nano Banana

Specs

What each model can do.

Feature Nano Banana Pro GPT-Image 1.5
Text-to-Image Yes Yes
Image-to-Image Yes Yes
Max Resolution 4K (4096×4096) 1K (1024×1024)
Average Speed 18.6s 40.0s
Cost via fal.ai
$0.15
per image
$0.009–$0.20
low–high quality
Architecture Multimodal LLM Multimodal LLM
Providers fal.ai, OpenRouter, Google AI fal.ai, OpenAI

Use both models in VM Studio

Install VM Studio and compare Nano Banana Pro vs GPT-Image 1.5 on your own prompts.

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