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Documentation Index

Fetch the complete documentation index at: https://docs.apiyi.com/llms.txt

Use this file to discover all available pages before exploring further.

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Overview

The Nano Banana series includes three image generation models, all available through API易 at prices significantly lower than official rates. This page summarizes all Nano Banana model pricing to help you choose the best billing plan.
When calling the API, the token type you use determines the billing method. Both Nano Banana Pro and 2 support two billing modes: per-request and token-based. Each has two tiers: default stable tier and enterprise high-availability tier.

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Model Overview

FeatureNano Banana ProNano Banana 2Nano Banana (Gen 1)
Model IDgemini-3-pro-image-previewgemini-3.1-flash-image-previewgemini-2.5-flash-image
Max Resolution4K4K1K
Per-request$0.09/req$0.055/req$0.02/req
Token-basedBeta testing✅ Available❌ Not supported
Best Discount31.25% of official30.3% of official50% of official

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Nano Banana Pro Pricing

Model: gemini-3-pro-image-preview

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Per-request Billing

$0.09 per request, unified pricing for 1-4K resolution. Simple billing, great savings on 4K images.
ItemAPI易 DefaultTop-up +10%Top-up +20%Google Official
Price per image ($)$0.09$0.0818$0.075$0.24
Price per image (¥)¥0.63¥0.573¥0.525¥1.68
vs. Official37.5%34.0%31.25%/
Save up to 68.75% on 4K images! Per-request billing doesn’t differentiate by resolution — 4K costs the same as 1K, so higher resolution means better value.

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Token-based Billing (Not yet open, beta available)

ItemAPI易Google Official
Input$0.88/M tokens$2/M tokens
Output$52.8/M tokens$120/M tokens
vs. Official44%/
Estimated per-image cost:
ResolutionAPI易 EstimateGoogle Estimate
1-2K~$0.075~$0.134
4K~$0.11~$0.24
Token-based costs vary with input/output image tokens. These are estimates. Token-based billing is better for 1-2K images; per-request billing is more cost-effective for 4K.

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Nano Banana 2 Pricing

Model: gemini-3.1-flash-image-preview

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Per-request Billing

$0.055 per request, unified pricing for 1-4K resolution.
ItemAPI易 DefaultTop-up +10%Top-up +20%Google Official
Price per image ($)$0.055$0.05$0.0458$0.151
Price per image (¥)¥0.385¥0.35¥0.32¥1.68
vs. Official36.4%33.1%30.3%/

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Token-based Billing

ItemAPI易Google Official
Input$0.18/M tokens$0.5/M tokens
Output$21.6/M tokens$60/M tokens
vs. Official36%/
Estimated per-image cost:
ResolutionAPI易 EstimateGoogle Official
512px~$0.024$0.045
1K~$0.03$0.067
2K~$0.036$0.101
4K~$0.06$0.151
These are estimates based on actual input/output tokens. Stack with top-up bonuses (up to 20%) for even lower costs.

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Nano Banana Gen 1 Pricing

Model: gemini-2.5-flash-image 1K images only, fixed per-request billing.
ItemAPI易Google OfficialDiscount
Price per image$0.02/req$0.039/req~50% off
Also eligible for top-up bonus promotions.

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Top-up Bonuses

Stack top-up bonuses on top of already discounted prices for even greater savings.

Top-up Bonus Details

View current top-up bonus tiers and promotion details.

Token Management

Create and manage your API tokens.

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Token Type Selection Guide

When creating a token, the “Billing model” setting determines the billing method. Choose based on your primary use case:
ModelUse CaseRecommended Token Type
Nano Banana ProMixed 1-4K usageToken-based (priority)
Nano Banana Pro4K onlyPer-request
Nano Banana 2Mixed 0.5K-4K usageToken-based (priority)
Nano Banana 24K onlyPer-request
Simple rule: If you mainly generate 4K images, choose per-request billing (same price regardless of resolution). For mixed resolution usage, token-based billing saves more on lower resolutions.