Nano Banana 2 vs Nano Banana Pro: which model should you use?
A side-by-side comparison of Google's two production image models, with concrete guidance on when to pick each one.
Google ships two image generation models in production: Nano Banana 2 (officially Gemini 3.1 Flash Image Preview) and Nano Banana Pro (Gemini 3 Pro Image Preview). Both are excellent. They're not interchangeable, and picking the right one for the job will save you time and produce better results.
This guide compares them on the dimensions that actually matter when you're using them: speed, image quality, prompt fidelity, reference image handling, and cost.
Speed
Nano Banana 2 typically returns an image in 8 to 15 seconds. Nano Banana Pro takes 25 to 60 seconds. If you're iterating quickly — trying ten variations of a concept to find the right composition — the speed difference matters enormously. If you're generating a single final image and the time is irrelevant, it doesn't matter.
Image quality
Nano Banana Pro produces noticeably better images on average. The differences show up most in: fine detail (hair, fabric weave, leaf texture), facial coherence in close-ups, and complex multi-subject scenes. For wide environment shots and stylized illustrations, the gap narrows considerably.
Prompt fidelity
Pro follows long, detailed prompts more reliably. If your prompt is 100+ words with specific positioning, multiple subjects, and style instructions, Pro is much more likely to honor all of it. Nano Banana 2 starts to lose the thread on complex prompts and may drop or merge details.
Reference image handling
Both models accept up to 6 reference images in NoHiddenPrompt. Pro is better at 'character consistency' — keeping a subject's face or outfit consistent across generations using a reference. Nano Banana 2 is faster for style-only references where you just want a vibe match rather than identity preservation.
Cost
On the underlying API, Pro costs significantly more per image than Nano Banana 2. Within NoHiddenPrompt both are currently free, but expect the cost difference to influence model availability if usage scales.
When to pick Nano Banana 2
- Early exploration — testing concepts, compositions, color palettes.
- Quick edits and small variations on a result you're already happy with.
- Stylized illustration work where photoreal detail isn't critical.
- Anything where you'll generate 10+ images and pick the best one.
When to pick Nano Banana Pro
- Final renders for client work, social posts, or print.
- Detailed prompts (100+ words) with specific multi-subject layouts.
- Photorealistic portraits, especially close-ups with visible faces.
- Reference-driven work where character or style consistency matters.
- Any scene with text, signage, or logos (still imperfect, but Pro tries harder).
A workflow that uses both
The most effective workflow we've seen: start with Nano Banana 2 to find the composition. Generate 5 to 10 variations until you have one that captures the right vibe. Then take that result, click 'Use as reference,' switch to Pro, and generate a final render with the same prompt. You get the iteration speed of Nano Banana 2 and the polish of Pro.
Both models are good. The question isn't which one is 'better' in the abstract — it's which one fits the task in front of you.