Google’s image generation ecosystem in 2026 is more powerful — and more confusing — than ever. Between the Nano Banana models (Gemini’s native image generation), Imagen 4 (the standalone image model), and legacy options, choosing the right model for your budget requires a clear pricing map.
This guide breaks down every Google image generation API and what it actually costs per image, so you never overpay again.
🍌 What is “Nano Banana”?
If you’ve seen the banana emoji 🍌 next to some Gemini models in Google AI Studio, you’ve found the Nano Banana family. These are Gemini’s native image generation models — they can understand text, reason about it, AND generate images natively in one model.
There are two main variants:
| Model | Powered By | Model ID | Best For |
|---|---|---|---|
| Nano Banana 2 | Gemini 3.1 Flash Image | gemini-3.1-flash-image-preview |
Fast, affordable image generation |
| Nano Banana Pro | Gemini 3 Pro Image | gemini-3-pro-image-preview |
High-fidelity, professional-grade images |
The key difference? Nano Banana 2 is optimized for speed and cost, while Nano Banana Pro uses advanced “thinking” for precise, photorealistic output.
💰 Nano Banana 2 (Gemini 3.1 Flash Image) Pricing
Image output is priced at $60.00 per million output tokens. Since different resolutions use different token counts, the per-image price varies:
| Resolution | Pixels | Tokens Used | Price per Image | Batch API (50% Off) |
|---|---|---|---|---|
| 0.5K | 512×512 | 747 | $0.045 | $0.022 |
| 1K | 1024×1024 | 1,120 | $0.067 | $0.034 |
| 2K | 2048×2048 | 1,680 | $0.101 | $0.050 |
| 4K | 4096×4096 | 2,520 | $0.151 | $0.076 |
💡 Cost comparison: At $0.067 per 1K image, Nano Banana 2 is 3x cheaper than Nano Banana Pro at the same resolution. Use it for social media content, thumbnails, and rapid prototyping.
Free Tier
Nano Banana 2 is available in the free tier of Google AI Studio with rate limits — perfect for testing before committing to paid usage.
🎨 Nano Banana Pro (Gemini 3 Pro Image) Pricing
Image output is priced at $120.00 per million output tokens — 2× the cost of Nano Banana 2, but with significantly higher quality.
| Resolution | Pixels | Tokens Used | Price per Image | Batch API (50% Off) |
|---|---|---|---|---|
| 1K | 1024×1024 | 1,120 | $0.134 | $0.067 |
| 2K | 2048×2048 | 1,120 | $0.134 | $0.067 |
| 4K | 4096×4096 | 2,000 | $0.240 | $0.120 |
🎯 When to use Pro: Marketing campaigns, hero images, product photography, or any case where visual quality directly impacts revenue. The “thinking” capability means it better understands complex prompts.
Image input (for editing/inpainting): 560 tokens or approximately $0.0011 per image.
🖼️ Imagen 4 Pricing — The Standalone Powerhouse
Imagen 4 is Google’s dedicated image generation model — separate from Gemini. It’s optimized for the highest quality output with excellent text rendering and photorealism.
| Model Tier | Model ID | Price per Image | Best For |
|---|---|---|---|
| Imagen 4 Fast | imagen-4.0-fast-generate-001 |
$0.02 | High-volume generation, drafts, thumbnails |
| Imagen 4 Standard | imagen-4.0-generate-001 |
$0.04 | Balanced quality and cost |
| Imagen 4 Ultra | imagen-4.0-ultra-generate-001 |
$0.06 | Hero images, commercial-grade photography |
Additional Imagen 4 Costs
| Feature | Price |
|---|---|
| Image Editing (Inpainting) | ~$0.02 per edit |
| Upscaling | ~$0.06 per image |
🔥 Best deal alert: Imagen 4 Fast at $0.02/image is the cheapest high-quality image generation API on the market. It’s 3× cheaper than Nano Banana 2 at 1K resolution.
📊 Nano Banana vs. Imagen 4: Which Should You Use?
| Feature | Nano Banana 2 | Nano Banana Pro | Imagen 4 Fast | Imagen 4 Ultra |
|---|---|---|---|---|
| Price (1K image) | $0.067 | $0.134 | $0.02 | $0.06 |
| Text rendering | Good | Better | Best | Best |
| Multimodal I/O | ✅ Text + Image | ✅ Text + Image | ❌ Image only | ❌ Image only |
| Editing/Inpainting | ✅ Native | ✅ Native | ✅ Dedicated | ✅ Dedicated |
| Free tier | ✅ | Limited | ❌ Paid only | ❌ Paid only |
| Best for | Interactive apps | Premium content | Bulk generation | Hero imagery |
When to Use Each
- Imagen 4 Fast → You need volume at rock-bottom cost, and text rendering matters
- Imagen 4 Ultra → Commercial hero images where every pixel counts
- Nano Banana 2 → Your app needs to understand context AND generate images in one call
- Nano Banana Pro → You need AI “reasoning” about what to generate (e.g., “redesign this logo in a cyberpunk style”)
🧮 Real-World Cost Comparison
Scenario: Generate 10,000 marketing images at 1K resolution:
| Model | Total Cost | Time |
|---|---|---|
| Imagen 4 Fast | $200 | Fastest |
| Imagen 4 Ultra | $600 | Fast |
| Nano Banana 2 | $670 | Fast |
| Nano Banana Pro | $1,340 | Moderate |
| Nano Banana 2 (Batch) | $340 | 24-hour turnaround |
✅ Key Takeaways
- Imagen 4 Fast ($0.02/image) is the cheapest option for pure image generation
- Nano Banana 2 is the best choice when you need text understanding + image output in one model
- Nano Banana Pro delivers the highest quality but at 2× the cost of Banana 2
- Batch API saves 50% on Nano Banana models — use it for non-urgent workloads
- All models are available through Google AI Studio and the Gemini API
Get Started
Try the Nano Banana models in Google AI Studio (free tier available) or check the official pricing page for the latest rates.
Prices are current as of May 2026. Always verify with Google’s official documentation before production deployment.
