MiniMax H3 Text to Image API

Render legible in-image text at native 4K.

PlaygroundAPI
Pricing
~18.19s
POST /v2/minimax-h3-text-to-image · submit + poll
 1# pip install "segmind>=1.1.0"
 2# export SEGMIND_API_KEY="YOUR_API_KEY"
 3import segmind
 4
 5# Async (v2): submit to the queue and block until COMPLETED.
 6# run() returns the final result dict (600s deadline, 1.0s poll by default).
 7result = segmind.run(
 8    "minimax-h3-text-to-image",
 9    prompt="A straight-on view of a Victorian herbalist's cabinet: a grid of small oak drawers, each with a round brass cup handle and a cream card label in a brass frame. The front labels read 'VALERIANA', 'LAVANDULA', 'CALENDULA' and 'ARNICA' in black serif capitals. A hand-painted wooden header board above the drawers reads 'HOLLOWAY HERBALIST' with 'EST. 1894' beneath in gold leaf. A brass mortar and pestle and a set of apothecary scales rest on the counter below. Even daylight from a side window, aged wood grain and tarnished brass.",
10    speed="standard",
11    num_images=1,
12    area="4K",
13    aspect_ratio="4:3",
14)
15print(result["status"])                      # COMPLETED
16print(result.get("output"))                  # model output (e.g. media URL)
17print(result["metrics"]["inference_time"])   # server compute seconds
18
19# --- Or submit + poll manually (track request_id, control the cadence) ---
20from segmind import SegmindClient, InferenceFailed, InferenceTimeout
21
22client = SegmindClient()                      # reads SEGMIND_API_KEY
23payload = {
24    "prompt": "A straight-on view of a Victorian herbalist's cabinet: a grid of small oak drawers, each with a round brass cup handle and a cream card label in a brass frame. The front labels read 'VALERIANA', 'LAVANDULA', 'CALENDULA' and 'ARNICA' in black serif capitals. A hand-painted wooden header board above the drawers reads 'HOLLOWAY HERBALIST' with 'EST. 1894' beneath in gold leaf. A brass mortar and pestle and a set of apothecary scales rest on the counter below. Even daylight from a side window, aged wood grain and tarnished brass.",
25    "speed": "standard",
26    "num_images": 1,
27    "area": "4K",
28    "aspect_ratio": "4:3",
29}
30job = client.submit_async("minimax-h3-text-to-image", **payload)
31print(job.request_id)                         # available immediately
32try:
33    result = job.wait(timeout=600, interval=1.0)
34except InferenceTimeout as e:
35    print("still running:", e.request_id)
36except InferenceFailed as e:
37    print("failed:", e.detail)

API Endpoint

POSThttps://api.segmind.com/v1/minimax-h3-text-to-image

Parameters

promptrequired
string

Describe the image: subject, style, lighting and composition. Put text to render in quotes. Up to 32,000 characters.

Default: "A straight-on view of a Victorian herbalist's cabinet: a grid of small oak drawers, each with a round brass cup handle and a cream card label in a brass frame. The front labels read 'VALERIANA', 'LAVANDULA', 'CALENDULA' and 'ARNICA' in black serif capitals. A hand-painted wooden header board above the drawers reads 'HOLLOWAY HERBALIST' with 'EST. 1894' beneath in gold leaf. A brass mortar and pestle and a set of apothecary scales rest on the counter below. Even daylight from a side window, aged wood grain and tarnished brass."
areaoptional
string

Output area: about 1, 4 or 16 megapixels; exact width and height follow the aspect ratio. 4K costs more per image.

Default: "4K"
Allowed values :
"1K""2K""4K"
aspect_ratiooptional
string

Shape of the output. auto lets the model choose from the prompt.

Default: "auto"
Allowed values (12 total):
"auto""1:1""4:3""3:4""3:2""2:3""16:9""9:16""21:9""9:21"+2 more
enhance_promptoptional
boolean

Let the model expand the prompt before generating. Turn off to use the prompt as written; then set an aspect ratio other than auto or a size. Enhancement is billed as input text.

Default: true
num_imagesoptional
integer

1 to 10 images from one request. Each image is billed.

Default: 1Range: 1 - 10
output_compressionoptional
integer

JPEG/WEBP quality from 0 to 100; ignored for png.

Default: 95Range: 0 - 100
output_formatoptional
string

File format of the images.

Default: "jpeg"
Allowed values :
"jpeg""png""webp"
sizeoptional
string

Optional WIDTHxHEIGHT (e.g. 2720x1536) instead of resolution and aspect ratio: 655,360 to 20,000,000 pixels, ratio between 1:3 and 3:1.

speedoptional
string

standard is the base model; highspeed returns faster at a higher per-token price.

Default: "standard"
Allowed values :
"standard""highspeed"

Response Type

Returns: Text/JSON

Asynchronous requests (v2)

Use Async for video, long-running (>~60s), or high-concurrency workloads; Sync is simplest for fast image & LLM calls. Async submits a request and you poll it to completion.

  1. 1
    POST /v2/minimax-h3-text-to-image

    Submit — returns request_id, status_url, response_url

  2. 2
    GET /v2/requests/{id}/status

    Poll — until COMPLETED or FAILED

  3. 3
    GET /v2/requests/{id}

    Result — final response body

Status states

QUEUED— Accepted, waiting for a worker
PROCESSING— Running on a worker
COMPLETED— Done — result body is ready
FAILED— Errored (incl. content/RAI blocks)
  • A FAILED request is served as HTTP 422 — the body still carries the error detail.
  • An unknown or expired request_id returns HTTP 404.
  • Results are retained for 1 hour, then expire.
  • Content / RAI blocks surface as FAILED, not a separate state.
  • Track completion by polling the status endpoint.

Common Error Codes

The API returns standard HTTP status codes. Detailed error messages are provided in the response body.

400

Bad Request

Invalid parameters or request format

401

Unauthorized

Missing or invalid API key

403

Forbidden

Insufficient permissions

404

Not Found

Model or endpoint not found

406

Insufficient Credits

Not enough credits to process request

429

Rate Limited

Too many requests

500

Server Error

Internal server error

502

Bad Gateway

Service temporarily unavailable

504

Timeout

Request timed out