Nano Banana API Pricing: Complete Tier and Cost Breakdown

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The Nano Banana API is billed per image, and Google’s list prices run from $0.0336 (Nano Banana 2.1 or 2 Lite at 1K) to $0.24 (Nano Banana Pro at 4K). Nano Banana 2 costs $0.067 at 1K and $0.151 at 4K; the Batch API halves every rate. The original Nano Banana (Gemini 2.5 Flash Image, $0.039) is deprecated and shuts down on March 15, 2027. Below are all tiers by resolution, the cost of 100 images and a curl example.

Disclosure: I run Jantaris, a prepaid API that resells some of these models below Google’s list price. I compare it separately and say where it is not cheaper.

Five Nano Banana models map to four Gemini image models

“Nano Banana” is Google’s name for its Gemini image models. The API uses the Gemini model IDs:

• Nano Banana Pro (gemini-3-pro-image): the top tier, for complex prompts and detailed assets up to 4K.
• Nano Banana 2 (gemini-3.1-flash-image): faster and cheaper, with 0.5K, 1K, 2K and 4K outputs.
• Nano Banana 2.1 (gemini-nano-banana-2.1): the October 2026 update, half the price of Nano Banana 2 at 1K and 2K.
• Nano Banana 2 Lite (gemini-3.1-flash-lite-image): the budget tier, 1K only, and Google’s recommended replacement for the original model.
• Nano Banana (gemini-2.5-flash-image): the original, up to 1024×1024, deprecated and scheduled to shut down on March 15, 2027.

If you also track broader model shifts, see my breakdown on how Gemini 4 Argon pricing handles developer workloads.

Official Nano Banana API price by resolution

Google’s standard per-image prices on the Gemini API pricing page, read on 29 October 2026. The Batch column is the asynchronous Batch API, which returns results later at half the price.

Nano Banana Pro API costs less through a reseller

These are the five rates where my service, Jantaris, is below Google’s standard price (checked on its pricing page on 29 October 2026). Google’s Batch API is cheaper still for Nano Banana 2 and the original model, if you can wait for results.

You can check the active catalog on the Jantaris pricing page to review these image model rates directly. For Nano Banana 2 at 0.5K and 1K, Nano Banana 2.1 and Nano Banana 2 Lite, Google’s own price is lower, so use the Gemini API directly for those.

100 images cost from $3.36 to $24

• Nano Banana Pro (4K): 100 images cost $24.00 officially, compared to $7.50 through my service.
• Nano Banana Pro (1K/2K): 100 images cost $13.40 officially, compared to $7.00 through my service.
• Nano Banana 2 (4K): 100 images cost $15.10 officially, compared to $11.25 through my service.
• Nano Banana 2 (2K): 100 images cost $10.10 officially, compared to $8.75 through my service.
• Nano Banana 2 (1K): 100 images cost $6.70 at the official rate.
• Nano Banana 2.1 (1K): 100 images cost $3.36 at the official rate, or $1.68 through the Batch API.
• Original Nano Banana: 100 images cost $3.90 officially, compared to $3.59 through my service.

If your application also leverages video workflows, you might find my guide to Kling 4.0 pricing useful for estimating combined pipeline expenses.

A Nano Banana Pro API call with curl

Through Google you call the Gemini API with the model ID above. In Jantaris it is one POST request to /v1/generate with the prompt and resolution:

curl "https://jantaris.com/v1/generate?wait=60" -H "Authorization: Bearer $JANTARIS_API_KEY" -H "Content-Type: application/json" -d '{"model":"nano-banana-pro","input":{"prompt":"...","aspect_ratio":"4:5","resolution":"2k"}}'

The system returns a task containing an estimated_cost. If a generation fails, the held amount returns to your balance at $0 cost. For setup instructions and authentication parameters, refer to the developer quickstart documentation.

Frequently Asked Questions

Sources

• Google AI for Developers - Gemini Developer API pricing (standard and Batch image prices, deprecation of gemini-2.5-flash-image)
• Jantaris - Pricing (my service)
• Checked on 29 October 2026.

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