You can try it out for free on LMArena [0]: New Chat -> Battle dropdown -> Direct Chat -> Click on Generate Image in the chat box -> Click dropdown from hunyuan-image-3.0 -> gemini-3-pro-image-preview (nano-banana-pro).

I've only managed to get a few prompts to go through, if it takes longer than 30 seconds it seems to just time out. Image quality seems to vary wildly; the first image I tried looked really good but then I tried to refresh a few times and it kept getting worse.

[0] lmarena.ai/