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Moondream3 Preview [Caption]

Integrate

Model id moondream3-preview/caption
# Run the model; wait up to 20 s for the finished result in the same call
curl -X POST "https://api.doitong.ru/v1/run/moondream3-preview/caption?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "image": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
  }'

# Still "queued" or "running"? Poll with the id from the response:
curl "https://api.doitong.ru/v1/requests/REQUEST_ID?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY"

This request: ≈$0.002 2 API credits · ≈ ₽0.21 Run it on this page

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Moondream · Text

Your first result goes here

Build a request below and run it with your API key. Outputs are copied to our storage, kept forever or 7 days for free.

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Controls are generated from the model schema. The code and the price update as you change them.

•required image_url
Drop a file, or

URL pointing to the image for processing.

Advanced length · temperature · top_p
length default normal

Desired length for the generated caption.

Sampling temperature, ranging from 0 to 1; defaults to 0 when omitted. A higher value such as 0.8 increases randomness, while a lower value such as 0.2 produces more focused, deterministic output.

Probability mass for nucleus sampling, ranging from 0 to 1.

POST /run/moondream3-preview/caption?wait=20 quote → $0.002
# Run the model; wait up to 20 s for the finished result in the same call
curl -X POST "https://api.doitong.ru/v1/run/moondream3-preview/caption?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "image": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
  }'

# Still "queued" or "running"? Poll with the id from the response:
curl "https://api.doitong.ru/v1/requests/REQUEST_ID?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY"

Run this request

Your key stays in this browser: it is sent only to the Doitong API and saved (localStorage) only if you tick Remember. Get an API key

About Moondream3 Preview [Caption]

Takes an image from `image_url` and returns a text caption. The `length` option selects short, normal or long, with normal as the default. Optional `temperature` and `top_p`, both from 0 to 1, control sampling. The output includes the caption plus a finish reason and usage info.

Parameters

Send either the canonical name or the native name, not both. Canonical names

NameType DefaultAllowed Description
image_urlrequired image
Typeurl · image
URL pointing to the image for processing.
lengthoptional
Typeenum
Defaultnormal
shortnormallong
Desired length for the generated caption.
temperatureoptional
Typenumber | null
0 – 1
Sampling temperature, ranging from 0 to 1; defaults to 0 when omitted. A higher value such as 0.8 increases randomness, while a lower value such as 0.2 produces more focused, deterministic output.
top_poptional
Typenumber | null
0 – 1
Probability mass for nucleus sampling, ranging from 0 to 1.
required Canonical name, also accepted

File parameters take a public https:// URL, a data: URI up to 10 MB, or the file_url of an upload. Files

Output

GET /requests/req_8k2m4q7x1z9c3v5b6n0p2r4t
{
  "id": "req_8k2m4q7x1z9c3v5b6n0p2r4t",
  "object": "request",
  "model": "moondream3-preview/caption",
  "status": "succeeded",
  "created_at": "2026-10-20T12:00:00Z",
  "started_at": "2026-10-20T12:00:02Z",
  "completed_at": "2026-10-20T12:00:09Z",
  "queue_position": null,
  "cost": {
    "credits": 2,
    "usd": "0.002",
    "charged": 2,
    "refunded": 0
  },
  "input": {
    "image_url": "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
  },
  "output": {
    "finish_reason": "stop",
    "usage_info": {
      "input_tokens": 1,
      "output_tokens": 1,
      "prefill_time_ms": 1.0,
      "decode_time_ms": 1.0,
      "ttft_ms": 1.0
    },
    "output": "A hedgehog is captured in a close-up shot, focusing on its face and nose. The hedgehog's spines are visible along its back, and its nose is dark and wet-looking. A gold ring with a small diamond is positioned on the grass in front of the hedgehog, partially obscured by its nose. The background is a blurred green grassy field, with small white flowers scattered throughout the grass."
  },
  "outputs": [
    {
      "type": "file",
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
      "content_type": "image/jpeg",
      "file_size": 1843200,
      "stored": true
    }
  ],
  "error": null,
  "metrics": {
    "inference_seconds": 6.8
  },
  "urls": {
    "self": "https://api.doitong.ru/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t",
    "cancel": "https://api.doitong.ru/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t/cancel"
  }
}
Your files, your choiceEvery outputs[].url is a copy on our storage: kept forever (paid per GB-month) or 7 days for free, by your account setting or ?storage=.
Same shape on every modeltype, url, content_type, width, height and duration, for images, video and audio alike. output is the model’s own result object.
Fields of output
finish_reason
stringReason that output generation ended.
usage_info
object {input_tokens, output_tokens, prefill_time_ms, decode_time_ms, ttft_ms}Request usage details.
output
stringCaption generated to describe the image.

More models: Vision

For AI agents: this page as Markdown is at https://doitong.com/en-GB/developers/models/moondream3-preview/caption.md. All models and guides: https://doitong.com/developers/llms.txt