moondream3.1-9B-A2B

Image-to-Text • Moondream

Moondream 3 is a fast, efficient 9B mixture-of-experts vision language model (2B active parameters) that delivers frontier-level visual reasoning for tasks like object detection, pointing, OCR, and structured output.

Model Info
Vision	Yes
Unit Pricing	$0.30 per M input tokens, $1.00 per M output tokens

Usage

export interface Env {
  AI: Ai;
}


export default {
  async fetch(request: Request, env: Env): Promise<Response> {
    const res = await fetch("https://cataas.com/cat");
    const blob = await res.arrayBuffer();
    const input = {
      image: [...new Uint8Array(blob)],
      prompt: "Generate a caption for this image",
      max_tokens: 512,
    };
    const response = await env.AI.run(
      "@cf/moondream/moondream3.1-9B-A2B",
      input
      );
    return new Response(JSON.stringify(response));
  },
} satisfies ExportedHandler<Env>;

task

stringdefault: queryenum: query, caption, point, detectWhich Moondream skill to run.

image

stringInput image as a public HTTPS URL or base64 data URI. Optional for `query`; required for `caption`, `point`, and `detect`.

question

stringdefault: What's in this image?Question for the `query` task.

caption_length

stringdefault: normalenum: short, normal, longCaption length for the `caption` task.

target

stringdefault: personObject phrase to locate for `point` and `detect` tasks (e.g. 'person wearing a red shirt').

reasoning

booleandefault: trueEnable reasoning trace for the `query` task.

temperature

numberdefault: 0.2minimum: 0maximum: 2Sampling temperature.

top_p

numberdefault: 0.9minimum: 0maximum: 1Top-p (nucleus) sampling.

max_tokens

integerdefault: 8192minimum: 1maximum: 28672Max tokens to generate for `query` and `caption`.

max_objects

integerdefault: 150minimum: 1maximum: 500Max objects to return for `point` and `detect`.

stream

booleandefault: trueReturn incremental tokens for `query` and `caption`. `point` and `detect` do not support streaming.

finish_reason

stringReason the generation finished.

▶metrics{}

object

answer

stringAnswer text for the `query` task. Null for other tasks.

caption

stringCaption text for the `caption` task. Null for other tasks.

▶points[]

arrayLocated points for the `point` task. Null for other tasks.

▶objects[]

arrayDetected bounding boxes for the `detect` task. Null for other tasks.

▶reasoning{}

objectReasoning trace for the `query` task when reasoning=true. Null otherwise.

API Schemas (Raw)

Input

Output