GPT Image 1.5 vs Nano Banana Pro
OpenAI's GPT Image 1.5 and Google's Nano Banana Pro 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
GPT Image 1.5 is the cheaper option — roughly 3.2x less on a blended workload, and it suits complex multi-subject composition. Nano Banana Pro justifies its premium when you need multi-image compositing and iterative edits.
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.
Google • Gemini Image
$0.13 / $
/ image (input / output)
Google's premium image tier, aimed at workflows that feed several source images in and refine the result across turns rather than generating one-shot. The most expensive option in this table at 4K, and the batch lane halves it for anything that does not need a synchronous response.
Input price
Nano Banana Pro is 3.2x the price than GPT Image 1.5 on input tokens.
Specification comparison
| Attribute | GPT Image 1.5 | Nano Banana Pro |
|---|---|---|
| Input (/ image) | $0.04 | $0.13 |
| Output (/ image) | — | — |
| Cached input | — | — |
| Context window | — | — |
| Max output | — | — |
| Native reasoning | No | No |
| Knowledge cutoff | — | — |
| Relative latency | medium | medium |
| Open weights | No | No |
| API model ID | gpt-image-1.5 | gemini-3-pro-image |
| Status | stable | stable |
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.
Nano Banana Pro: 1K–2K resolution on the standard tier; 4K is $0.24. Batch and Flex lanes cut both roughly in half, to $0.067 and $0.12.
Choose GPT Image 1.5 if…
- Complex photorealistic scenes
- Multi-subject compositions
- Editorial and hero imagery
- Iterative image editing
Choose Nano Banana Pro if…
- Compositing multiple source images
- Iterative art direction
- High-resolution brand assets
- Complex edit chains
Frequently asked
Is GPT Image 1.5 or Nano Banana Pro cheaper?
GPT Image 1.5 is cheaper. On a blended 3:1 input-to-output workload it costs about 3.2x less than Nano Banana Pro.
Which has the larger context window, GPT Image 1.5 or Nano Banana Pro?
Both accept up to — tokens, so context is not a differentiator here.
Should I use GPT Image 1.5 or Nano Banana Pro?
Pick GPT Image 1.5 for complex multi-subject composition. Pick Nano Banana Pro for multi-image compositing and iterative edits. If cost dominates the decision, GPT Image 1.5 wins; if you need the capability ceiling, benchmark both on your own evals before committing.