Image model comparison

Nano Banana 2.1 vs GPT Image 2.5

Google's Nano Banana 2.1 and OpenAI's GPT Image 2.5, side by side: price per image, image sizes, editing and aspect ratios — and when to choose which. Both run on one Cheaper Gen. API key.

Google

Up to −59%

Nano Banana2.1

Nano Banana 2.1

Google's newest Nano Banana — top-ranked quality at a quarter of Pro's price

from

$0.022/image

OpenAI

Up to −12%

GPT Image2.5

GPT Image 2.5

OpenAI's top image model — precise edits, perfect text, up to 4K

from

$0.0066/image

Price

Nano Banana 2.1 vs GPT Image 2.5: price per image

Live prices at the tiers both models offer. Official list prices are on each model's pricing page.

Nano Banana 2.1 and GPT Image 2.5 prices at shared tiers
Tier	Nano Banana 2.1	GPT Image 2.5	Cheaper
1K	$0.022/image 1K	$0.0066/image 1K · low	GPT Image 2.5 −70%
2K	$0.033/image 2K	$0.0118/image 2K · low	GPT Image 2.5 −64%

Nano Banana 2.1 pricing →Cheap Nano Banana 2.1 API →GPT Image 2.5 pricing →Cheap GPT Image 2.5 API →

Specs

Side-by-side specifications

From each model's API parameters in our catalog.

Nano Banana 2.1 vs GPT Image 2.5 specifications
Spec	Nano Banana 2.1	GPT Image 2.5
Developer	Google	OpenAI
Released	Oct 6, 2026	Sep 8, 2026
Tasks	Text to image, Image editing	Text to image, Image editing
Sizes	1K · 2K · 4K	1K · 2K · 4K
Edit inputs	Up to 14 images	Up to 16 images
Quality levels	—	low · medium · high · xhigh · max
Aspect ratios	14 (1:1, 2:3, 3:2, 3:4, 4:3, 4:5…)	11 (1:1, 3:2, 2:3, 4:3, 3:4, 5:4…)
Starting price	$0.022/image (1K)	$0.0066/image (1K · low)
Below official price	up to 59%	up to 12%

Verdict

When to choose which

Each point below comes from the price and spec data above.

Choose Nano Banana 2.1 for

More aspect ratios: 14 vs 11.
Newer model (released October 6, 2026).

Nano Banana 2.1 at a glance

Up to 4K — 1K, 2K and 4K output
Low price — About 2 cents per 1K image
14 inputs — Multi-image editing
14 ratios — From 8:1 banners to 1:8

Choose GPT Image 2.5 for

Lower price: $0.0066/image vs $0.022/image at 1K (70% less).
Edits with up to 16 input images (vs 14).

GPT Image 2.5 at a glance

Up to 4K — 1K, 2K and 4K tiers
5 quality levels — Low to max
16 references — Multi-image editing
Precise text — Layouts and labels

Try both with the same prompt

Same API key and balance; only the endpoint changes. Failed generations are refunded.

POST /api/v1/run/google/nano-banana-2.1/text-to-image
POST /api/v1/run/openai/gpt-image-2.5/text-to-image

Nano Banana 2.1 in Studio GPT Image 2.5 in Studio

FAQ

Nano Banana 2.1 vs GPT Image 2.5 questions

GPT Image 2.5 is cheaper at 2 of 2 shared tiers. 1K: Nano Banana 2.1 $0.022/image, GPT Image 2.5 $0.0066/image; 2K: Nano Banana 2.1 $0.033/image, GPT Image 2.5 $0.0118/image. Prices are live and billed per image.

Nano Banana 2.1: up to 4K, edits with up to 14 input images. GPT Image 2.5: up to 4K, edits with up to 16 input images.

Yes. Both run through the same Cheaper Gen. API and balance: POST /v1/run/{endpoint} with the model's endpoint id, then poll or receive a webhook. Switching models means changing the endpoint and its input fields — no new account or SDK.

Keep comparing

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All comparisons →All AI image APIs →Cheapest image APIs →

Nano Banana 2.1 is developed by Google; GPT Image 2.5 by OpenAI. Cheaper Gen. provides API access to both through official upstream endpoints and does not own either model. Trademarks belong to their respective owners.