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MiniMax H3 Image API & Spicy Options — Text-to-Image & Editing up to 4K

MiniMax H3 Image generates and edits images with built-in prompt enhancement. Call the standard and Highspeed tiers through one Muapi API key for text-to-image and multi-reference editing with up to 16 input images and 1K, 2K or 4K output.Pricing is pay-per-generation from $0.03 per image, with no subscription. Highspeed is the faster tier at twice the standard price. Looking for the spicy angle? Read the moderation FAQ below before you build.

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🆕 MiniMax H3 Image

Lowest price per image, up to 4K — live now2 models

T2INew

Standard

MiniMax H3 Image

Text-to-image with built-in prompt enhancement, 13 aspect ratios and 1K, 2K or 4K output as PNG, JPG or WEBP.

1K–4K

$0.03–$0.09/image

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EditNew

Standard

MiniMax H3 Image Edit

Edit or combine up to 16 reference images with a text instruction, keeping the first image's aspect ratio.

1K–4K

From $0.038/image

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⚡ MiniMax H3 Image Highspeed

Faster tier for drafts and high-volume jobs2 models

T2INew

Highspeed

MiniMax H3 Image Highspeed

The faster tier for text-to-image, with the same parameters and 1K, 2K or 4K output.

1K–4KFast

$0.06–$0.18/image

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EditNew

Highspeed

MiniMax H3 Image Highspeed Edit

The faster tier for editing and combining up to 16 reference images at 1K, 2K or 4K.

1K–4KFast

From $0.076/image

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What is the MiniMax H3 Image API?

The MiniMax H3 Image API is Muapi's REST interface to MiniMax's H3 image model. It exposes four endpoints under one authentication flow and one asynchronous task lifecycle: text-to-image and image editing, each in a standard and a Highspeed tier.

H3 Image expands short prompts with built-in prompt enhancement, renders at 1K, 2K or 4K (up to 20 megapixels), and edits or combines up to 16 reference images in a single request.

Muapi prices every call per generation, so you pay for the resolution and input images you use. For video, see the [MiniMax H3 video family](/minimax-h3).

MiniMax H3 Image API capabilities

Built-in prompt enhancement

Short prompts are expanded into detailed instructions, so simple descriptions still produce rich images.

1K, 2K and 4K output

Iterate at 1K and render finals at 4K from the same endpoint, as PNG, JPG or WEBP.

13 aspect ratios

From 1:2 and 2:1 to 9:16 vertical, 16:9 and 21:9 cinematic, set with aspect_ratio on text-to-image.

Up to 16 reference images

Edit one photo or combine many into a single composition while the output follows the first image's aspect ratio.

Standard and Highspeed tiers

Pick the lowest price per image or the faster Highspeed tier with identical parameters.

Simple per-generation pricing

1K and 2K cost the same, aspect ratio and output format are free, and edits add a small per-input-image charge.

MiniMax H3 Image use cases

Marketing and social creative

Produce posters, ads and social graphics at up to 4K.

Product and ecommerce imagery

Swap backgrounds, relight and restyle product shots from reference photos.

Multi-reference composition

Combine up to 16 images into one coherent scene or campaign visual.

Rapid concept iteration

Use Highspeed for fast drafts, then finish winners on the standard tier at higher resolution.

MiniMax H3 Image endpoints and pricing

Endpoint	Input	Price	Best for
MiniMax H3 Image (text-to-image)	Prompt	$0.03/image at 1K and 2K; $0.09 at 4K	Lowest price per image
MiniMax H3 Image Edit	Prompt + up to 16 images	Output price + $0.008 per input image	Edits and multi-reference composition
MiniMax H3 Image Highspeed (text-to-image)	Prompt	$0.06/image at 1K and 2K; $0.18 at 4K	Fast drafts and high-volume jobs
MiniMax H3 Image Highspeed Edit	Prompt + up to 16 images	Output price + $0.016 per input image	Fast edits and batch editing

Quick start — MiniMax H3 Image API code examples

Submit a request, receive a request ID immediately, and poll the result endpoint until the task completes.

Generate an image

curl -X POST https://api.muapi.ai/api/v1/minimax-h3-image-text-to-image \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"prompt":"A frosted glass serum bottle on wet travertine stone, soft morning light","aspect_ratio":"4:5","resolution":"2K","output_format":"png"}'

# Response: {"request_id":"REQUEST_ID"}

Text-to-image at 2K with a 4:5 aspect ratio.

Edit an image

curl -X POST https://api.muapi.ai/api/v1/minimax-h3-image-edit \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"prompt":"Replace the background with a rainy blue-hour street, keep the subject unchanged","images_list":["https://example.com/photo.jpg"],"resolution":"2K"}'

# Response: {"request_id":"REQUEST_ID"}

Edit or combine up to 16 reference images.

Use the Highspeed tier

curl -X POST https://api.muapi.ai/api/v1/minimax-h3-image-highspeed-text-to-image \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"prompt":"Isometric illustration of a tiny coffee shop, pastel palette","aspect_ratio":"16:9","resolution":"1K"}'

# Response: {"request_id":"REQUEST_ID"}
# Highspeed is the faster tier and costs 2x the standard price.

Fast text-to-image draft at 1K.

Poll the result

curl https://api.muapi.ai/api/v1/predictions/REQUEST_ID/result \
  -H "x-api-key: YOUR_API_KEY"

# Poll until status is completed, then read the image URL from the response.

Poll until the task is completed, then read the image URL from the response.

Frequently asked questions

What is the MiniMax H3 Image API?

It is Muapi's REST API for MiniMax's H3 image model, with text-to-image and image-editing endpoints in standard and Highspeed tiers under one API key.

How much does the MiniMax H3 Image API cost?

Standard costs $0.03 per image at 1K and 2K and $0.09 at 4K, plus $0.008 per input image on edits. Highspeed is exactly twice that: $0.06 at 1K and 2K, $0.18 at 4K and $0.016 per input image.

Is there a MiniMax H3 Image spicy mode?

No. The MiniMax H3 Image API runs with standard content-safety moderation, so explicit adult output is not guaranteed, and requests that are rejected are refunded. For relaxed-moderation tiers on Muapi, see the [MiniMax H3 Spicy](/minimax-h3-spicy) video API, [Seedance 2.5 Spicy](/seedance-2.5-spicy) or the [AI spicy image generator](/ai-spicy-image-generator).

How do I get a MiniMax H3 Image API key?

Create a Muapi account, generate an API key on the access keys page, and send it in the x-api-key header. The same key works for all four H3 Image endpoints and every other model on Muapi.

What is the difference between H3 Image and H3 Image Highspeed?

Both accept the same parameters. Highspeed is the faster tier and is priced at twice the standard rate; use it for drafts and high-volume jobs and the standard tier for the lowest price per image.

How many reference images can I use?

Up to 16 images in images_list on the edit endpoints. The output follows the first image's aspect ratio.

Which resolutions and formats are supported?

1K, 2K and 4K output as PNG, JPG or WEBP, set with resolution and output_format. Aspect ratio and output format add no extra charge.

Does prompt enhancement run automatically?

Yes. H3 Image expands your prompt automatically, which helps short prompts, but detailed prompts with subject, lighting and composition still give the most control.

Is MiniMax H3 Image available through the API now?

Yes. All four endpoints are live on Muapi, and sandbox keys return mock results with no credits deducted.

MiniMax H3 video API →Text-to-video, image-to-video and reference-to-video from the same H3 family.MiniMax H3 Spicy API →Relaxed-moderation H3 image-to-video generation.AI spicy image generator →Spicy image generation options on Muapi.Seedream 5.5 API →Compare with ByteDance's photorealistic image model with transparent backgrounds.Browse image models →Compare MiniMax H3 Image with other live image-generation APIs.Create an API key →Start calling MiniMax H3 Image through Muapi.

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