MiniMax H3 Image Highspeed API
MiniMax H3 Image Highspeed is the faster variant of MiniMax H3 Image. It accepts the same parameters and offers the same capabilities, generates images faster, and its image input and output token rates are twice those of the standard model. On APIMart you call it with the model ID minimax-h3-image-highspeed.
Service Highlights
- Official Discounts
- Pay-as-you-go
- Fast & Low Latency
Image link valid for 72 hours
MiniMax H3 Image Highspeed API Pricing
Transparent pricing with no hidden fees. Pay only for what you use.
| Variant | Tier | GoldCurrent price | Platinum | Diamond | Official | Your savings |
|---|---|---|---|---|---|---|
minimax-h3-image-highspeedPrices are estimates; actual cost is billed by token usage. | 1K/2K | 0.3354Credits/pic~$0.0335/pic | 0.3187Credits/pic~$0.0319/pic | 0.3019Credits/pic~$0.0302/pic | 0.4193Credits/pic~$0.0419/pic | 20% |
| 4K | 1.2131Credits/pic~$0.1213/pic | 1.1525Credits/pic~$0.1152/pic | 1.0918Credits/pic~$0.1092/pic | 1.5164Credits/pic~$0.1516/pic | 20% |
* Actual costs are subject to final output.
* Billed by tokens. The rows are single-image text-to-image estimates: image output plus about 2,000 text input tokens for prompt enhancement. Reference images add image input tokens. The cost field of each task shows the actual charge.
MiniMax H3 Image Highspeed API: Faster Text to Image and Editing up to 4K
The Highspeed variant generates faster with the same parameters as MiniMax H3 Image: text to image, or editing with up to 16 reference images, at 1K, 2K or 4K or an exact pixel size, with up to 10 images per request.
MiniMax H3 Image Highspeed API Example: Text to Image and Image Editing
Call MiniMax H3 Image Highspeed on APIMart with one POST request. Generation is asynchronous: submit a task, then poll the task endpoint to get the image URLs.
- 1
Authenticate MiniMax H3 Image Highspeed API requests
Save your APIMart key in the APIMART_API_KEY environment variable and send it as Authorization: Bearer <key> on every request.
- 2
Submit a MiniMax H3 Image Highspeed task
POST /v1/images/generations with model minimax-h3-image-highspeed, your prompt, size and resolution. Add image_urls to edit with reference images. The task ID is in data[0].task_id.
- 3
Get the generated images
Poll GET /v1/tasks/{task_id} every 3 to 5 seconds until status is completed, then read the image URLs from data.result.images[0].url. Results are kept for 72 hours, so download them in time.
See the MiniMax H3 Image Highspeed API reference for every parameter, size rule and response field.
curl -X POST https://api.apimart.ai/v1/images/generations \
-H "Authorization: Bearer $APIMART_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "minimax-h3-image-highspeed",
"prompt": "A cozy coffee shop by the sea at sunset, photorealistic, warm tones",
"size": "16:9",
"resolution": "2K"
}'import os
import time
import requests
API_BASE = "https://api.apimart.ai"
headers = {"Authorization": f"Bearer {os.environ['APIMART_API_KEY']}"}
# 1. Submit the generation task
payload = {
"model": "minimax-h3-image-highspeed",
"prompt": "A cozy coffee shop by the sea at sunset, photorealistic, warm tones",
"size": "16:9",
"resolution": "2K"
}
resp = requests.post(f"{API_BASE}/v1/images/generations", headers=headers, json=payload, timeout=60)
resp.raise_for_status()
task_id = resp.json()["data"][0]["task_id"]
# 2. Poll the task until it finishes
for _ in range(200):
task_resp = requests.get(f"{API_BASE}/v1/tasks/{task_id}", headers=headers, timeout=30)
task_resp.raise_for_status()
task = task_resp.json()["data"]
if task["status"] == "completed":
print(task["result"]["images"][0]["url"][0])
break
if task["status"] == "failed":
raise RuntimeError(task.get("error", {}).get("message", "generation failed"))
time.sleep(3)
else:
raise TimeoutError(f"task {task_id} did not finish in time; continue GET polling with this task ID")curl -X POST https://api.apimart.ai/v1/images/generations \
-H "Authorization: Bearer $APIMART_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "minimax-h3-image-highspeed",
"prompt": "Put the jacket from the second image on the person in the first image, keep the background unchanged",
"image_urls": [
"https://example.com/person.jpg",
"https://example.com/jacket.png"
],
"resolution": "2K"
}'TASK_ID="task_xxx" # replace with the task_id returned by the POST request
curl "https://api.apimart.ai/v1/tasks/$TASK_ID" \
-H "Authorization: Bearer $APIMART_API_KEY"MiniMax H3 Image Highspeed API Parameters
| Parameter | Type | Required | Default | Description |
|---|---|---|---|---|
model | string | Required | Default: minimax-h3-image-highspeed | Use minimax-h3-image-highspeed. |
prompt | string | Required | Default: — | Image description, 1 to 32,000 characters after trimming. |
size | string | Optional | Default: auto | auto, an aspect ratio such as 16:9 (1:3 to 3:1), or pixels such as 2048x1152 (655,360 to 20,000,000 pixels in total). |
aspect_ratio | string | Optional | Default: — | Another way to pass the aspect ratio, such as 16:9. If set, it overrides size. |
resolution | string | Optional | Default: 4K | 1K, 2K or 4K. Cannot be used when size is in pixels. |
n | integer | Optional | Default: 1 | Number of images, 1 to 10. |
image_urls | string[] | Optional | Default: — | Up to 16 reference images as URLs or Base64 data URIs. Adding them switches to editing. |
prompt_optimizer | boolean | Optional | Default: true | Expands the prompt before generating. false works only for text to image with an explicit size. |
output_format | string | Optional | Default: jpeg | jpeg, png or webp. |
output_compression | integer | Optional | Default: 95 | Compression quality from 0 to 100. Ignored for png. |
watermark | boolean | Optional | Default: false | Adds a visible AI-generated watermark to the image. |
