Imagen

Cheapest AI Image API for Developers

At 100,000 images a month, the $149 Open Source Unlimited plan works out to $0.0015 per image across Flux, SDXL and 10,000+ open models. At 10,000 images, Standard ($47) is $0.0047 per image.

See Plans — From $21/Month API Documentation

Last updated Sep 23, 2026 · By ModelsLab Engineering

Why ModelsLab Is the Cheapest AI Image API

The Cheapest AI Image API: $0.0015 Per Image at 100,000 a Month

The lowest effective cost on ModelsLab is $0.0015 per image: the $149/month Open Source Unlimited plan divided by 100,000 images. At 500,000 images a month the same plan is $0.0003 per image. The plan has no per-image charge on Flux, SDXL, Stable Diffusion 3.5 and the 10,000+ open-source models ModelsLab self-hosts, so the effective price falls every time your volume goes up.

At lower volume, pick the smallest plan that covers your calls. Standard is $47/month for 10,000 API calls, which is $0.0047 per image when you use all of them. Basic is $21/month for 3,250 calls, or $0.0065 per image. Above 10,000 images a month, Open Source Unlimited is the plan that fits, and its per-image cost drops below Standard’s $0.0047 at about 31,700 images.

For comparison, on 2026-09-23 Replicate listed FLUX.1 schnell at $3.00 per thousand images ($0.003 each) and fal listed it at $0.003 per megapixel. Per-image pricing is cheaper at a few thousand images; a flat plan is cheaper at volume. The tables below show where each option wins.

Cheap Does Not Mean Low Quality

ModelsLab keeps costs low through efficient infrastructure, not by compromising on quality. Every plan includes:

10,000+ models including Flux (photorealistic), SDXL (versatile), and SD 3.5 (latest)
ControlNet for guided generation (pose, depth, edge, canny)
No resolution upcharge on plan calls
Up to 4 images per request on the v7 text-to-image endpoint
Popular models such as Flux and SDXL stay loaded on our GPUs
Negative prompts, seed control, and guidance scale
Inpainting, outpainting, image-to-image, and upscaling
Plans start at $21/month (Basic, 3,250 API calls)

Cost Per Image by Monthly Volume

Plan price divided by the images you generate in a month, with one image per API call. A dash means the volume is above that plan's monthly call limit.

Images / month	Basic $21	Standard $47	Open Source Unlimited $149	Lowest cost per image
3,250	$0.0065	$0.0145	$0.0458	$0.0065 (Basic)
10,000	—	$0.0047	$0.0149	$0.0047 (Standard)
50,000	—	—	$0.0030	$0.0030 (Unlimited)
100,000	—	—	$0.0015	$0.0015 (Unlimited)
500,000	—	—	$0.0003	$0.0003 (Unlimited)

ModelsLab plan prices and call limits from the live plans table on 2026-09-23: Basic $21/month for 3,250 API calls, Standard $47/month for 10,000 API calls, Open Source Unlimited $149/month with no call limit on the open-source models ModelsLab self-hosts (15 concurrent requests). Third-party image models such as Nano Banana, GPT Image and Seedream are paid per call from the usage included in Basic and Standard, then from wallet balance; on Open Source Unlimited they are billed from wallet balance.

AI Image API Cost at 100,000 Images a Month

List prices from each vendor's own pricing page, checked 2026-09-23, multiplied out to 100,000 images at about one megapixel each.

Provider	Model	Listed price (checked 2026-09-23)	100,000 images
ModelsLab Open Source Unlimited	Flux, SDXL and 10,000+ open models	$149/month flat	$149 ($0.0015 each)
Replicate	FLUX.1 schnell	$3.00 per 1,000 images	$300
fal	FLUX.1 schnell	$0.003 per megapixel	$300 or more
Replicate	FLUX.1 dev	$0.025 per image	$2,500
fal	Seedream V4	$0.03 per image	$3,000

Sources: replicate.com/pricing (FLUX.1 schnell $3.00 per thousand output images, FLUX.1 dev $0.025 per output image) and fal.ai (FLUX.1 schnell $0.003 per megapixel, billed by rounding up to the nearest megapixel; Seedream V4 $0.03 per image), all checked 2026-09-23. Vendor prices change; check the linked pages before you commit.

Generate Images at the Lowest Cost

Same quality, fraction of the price.

Generate 4 images in one request (Python)

Python

1import requests
2
3url = "https://modelslab.com/api/v7/images/text-to-image"
4payload = {
5    "key": "YOUR_API_KEY",
6    "model_id": "flux",
7    "prompt": "professional product photography, white background, studio lighting",
8    "width": 1024,
9    "height": 1024,
10    "samples": 4  # up to 4 images per request
11}
12
13response = requests.post(url, json=payload)
14data = response.json()
15
16for i, url in enumerate(data["output"]):
17    print(f"Image {i+1}: {url}")

Work out your cost per image (Python)

Python

1# Plan price and monthly call limit from modelslab.com/pricing (2026-09-23).
2# None = no call limit on self-hosted open-source models.
3PLANS = {"Basic": (21, 3_250), "Standard": (47, 10_000), "Open Source Unlimited": (149, None)}
4
5def cost_per_image(images_per_month: int) -> tuple[str, float]:
6    fits = {
7        name: price / images_per_month
8        for name, (price, limit) in PLANS.items()
9        if limit is None or images_per_month <= limit
10    }
11    best = min(fits, key=fits.get)
12    return best, round(fits[best], 4)
13
14for volume in (3_250, 10_000, 50_000, 100_000, 500_000):
15    print(volume, cost_per_image(volume))
16# 100000 ('Open Source Unlimited', 0.0015)

Batch request with JavaScript

JavaScript

1const response = await fetch('https://modelslab.com/api/v7/images/text-to-image', {
2  method: 'POST',
3  headers: { 'Content-Type': 'application/json' },
4  body: JSON.stringify({
5    key: 'YOUR_API_KEY',
6    model_id: 'flux',
7    prompt: 'e-commerce product photo, professional studio',
8    width: 1024,
9    height: 1024,
10    samples: 4  // up to 4 images per request
11  })
12});
13
14const data = await response.json();
15console.log(`${data.output.length} images generated`);

Start Saving in 3 Steps

Switch to the cheapest AI image API in minutes.

STEP 01

Step 1: Sign Up

Create a ModelsLab account, subscribe to a plan (from $21/month), and get your API key from the dashboard. Every plan includes all 10,000+ models.

STEP 02

Step 2: Generate on Your Plan Calls

Send a POST request with your prompt and model_id. Each request uses one API call from your plan, with no resolution upcharge. Standard ($47 for 10,000 calls) is $0.0047 per image when you use every call.

STEP 03

Step 3: Move to Open Source Unlimited at $149/mo

When you need more than 10,000 images a month, move to Open Source Unlimited. It has no call limit on the open-source models ModelsLab self-hosts: $0.0030 per image at 50,000 a month and $0.0015 at 100,000.

Get API Key

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How ModelsLab Keeps Prices Low

ModelsLab achieves the lowest per-image pricing through infrastructure optimization, not quality compromises. Shared GPU clusters with intelligent model caching keep popular models warm without dedicated hardware per customer. Efficient batching and queue management maximize GPU utilization, passing savings to developers.

The Open Source Unlimited plan at $149/month works because the marginal cost of another image is near zero when the GPUs are already running. That is also why it covers only the open-source models ModelsLab self-hosts: third-party models such as Nano Banana, GPT Image and Seedream bill us per call, so on that plan they are billed per call from wallet balance. On Basic ($21) and Standard ($47) they are paid from the usage included in the plan first, then from wallet balance.

Which Plan Is Cheapest for Your Volume

Up to 3,250 images a month, Basic ($21) is the cheapest plan at $0.0065 per image. Up to 10,000, Standard ($47) is cheapest at $0.0047 per image. Above 10,000, Open Source Unlimited ($149) is the only plan without a call limit, and it goes from $0.0030 per image at 50,000 to $0.0015 at 100,000 and $0.0003 at 500,000.

Calls reset each billing cycle, so size the plan to a normal month. You can move between plans when your volume changes. Teams that need dedicated GPUs can use the enterprise plan from $249/month.

Why Developers Choose the Cheapest Option

Key advantages that set us apart

$0.0015 per image at 100,000 images a month on the $149 plan

$0.0047 per image at 10,000 images a month on Standard ($47)

No call limit on self-hosted open-source models with Open Source Unlimited

10,000+ models included at every price point

No resolution upcharge on plan calls

No model switching fees

Plans start at $21/month (Basic, 3,250 API calls)

Up to 4 images per request

Same quality as premium providers

Sub-3-second generation on A100 GPUs

Enterprise plan at $249/month for dedicated GPUs

Our Popular Use Cases

What teams build with affordable AI image generation:

Generate tens of thousands of product photos per month for $0.0015-$0.0030 each on Open Source Unlimited. Create lifestyle shots, white background images, and marketing visuals without studio costs.

AI Image Generation API
Text to image, image to image and inpainting on one endpoint.
Flux API
Flux models over REST, self-hosted.
Stable Diffusion API
SDXL, SD 1.5 and community checkpoints.
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Providers compared on price, speed and models.
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Image, video and speech prices side by side.
Unlimited AI API
Every self-hosted open-source model for $149/mo.

Cheapest AI Image API FAQ

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Plans from $21 a month

Basic is $21/month and Standard $47/month; self-hosted image models cost $0.0047 per image from that allowance. Open Source Unlimited is $149/month with no per-image charge on self-hosted models. Every plan covers Flux, SDXL and 10,000+ community models. Cancel anytime.

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At volume, ModelsLab: the $149/month Open Source Unlimited plan works out to $0.0015 per image at 100,000 images a month and $0.0003 at 500,000, across Flux, SDXL and 10,000+ open models. At 10,000 images a month, Standard ($47) is $0.0047 per image. At a few thousand images, per-image APIs such as Replicate FLUX.1 schnell ($0.003 per image, checked 2026-09-23) can cost less.

Genuinely free AI image APIs are rate-limited demos, not production tools. ModelsLab is paid-only but the cheapest at production quality: $0.0047 per image on self-hosted models on every plan, from $21/month (Basic) — all plans cover the full 10,000+ model catalogue.

Shared GPU clusters with intelligent model caching keep popular models warm without dedicated hardware per customer, and aggressive batching maximises GPU utilisation. Lower infra cost gets passed to developers — quality and resolution are unchanged.

No. ModelsLab runs the same open-source models other providers use (Flux, SDXL, SD 3.5) on A100/H100 GPUs. Output quality is identical — the cost difference comes from infrastructure efficiency, not lower-resolution outputs or smaller models.

Above 10,000 images a month, which is the Standard call limit. Open Source Unlimited works out to $0.0030 per image at 50,000 images, $0.0015 at 100,000 and $0.0003 at 500,000. Below 10,000, Standard ($47, $0.0047 per image at full use) or Basic ($21, about 4,470 images) costs less. Teams that need dedicated GPUs can use the enterprise plan from $249/month.

Common hidden costs to watch for: per-resolution upcharges, per-megapixel billing that rounds up, model-switching fees, cold-start surcharges and overage charges on monthly caps. On ModelsLab a generation on a self-hosted model uses one plan call whatever the model or resolution, and third-party models show their per-call price on the model page before you send the request.

ModelsLab at volume. Open Source Unlimited ($149/month) covers Flux, SDXL, SD 1.5, SD 3.5 and ~10,000 community fine-tunes with no per-image charge, which is $0.0015 per image at 100,000 images a month. For comparison, Replicate listed FLUX.1 dev at $0.025 per image on 2026-09-23.

You can request up to 4 images per call on the v7 text-to-image endpoint, which cuts HTTP overhead for high-volume workloads. On Open Source Unlimited there is no per-image charge on self-hosted models, so batching changes throughput rather than price.