Moondream3 Preview Caption

Moondream3 Preview Caption

Playground

Generate short, normal, or long image captions to help you understand and describe visual content. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing.

Features

Moondream 3 — Image Captioning

Moondream 3 Caption is a high-performance vision-language model that automatically generates clear, descriptive, and context-aware captions for any image. It supports multiple caption lengths, enabling flexible use across social media content, dataset annotation, and creative storytelling.

✨ Key Features

• Flexible Caption Length Choose from short, normal, or long captions to fit your workflow needs.

• Accurate Visual Understanding Trained on large-scale, diverse visual datasets — accurately detects objects, actions, and environments.

• Fast and Efficient Optimized for low-latency inference, suitable for real-time applications and batch processing.

• Human-like Language Output Produces smooth, natural, and grammatically correct sentences ideal for direct use in production.

⚙️ Example Usage

🔹 Short Caption

{
  "image": "https://example.com/photo.jpg",
  "length": "short"
}

🔹 Normal Caption

{
  "image": "https://example.com/photo.jpg",
  "length": "normal"
}

🔹 Long Caption

{
  "image": "https://example.com/photo.jpg",
  "length": "long"
}

🧾 Example Output

{
  "caption": "A young woman with long, dark hair stands in front of a bar. She wears a leopard print halter top and blue jeans, accessorized with large hoop earrings. The bar features a purple backlit counter and a lit sign displaying 'DAMON' in yellow letters."
}

Output Explanation

• The model returns a JSON object with a single key: caption.
• The value is a natural-language description automatically generated from the input image.
• The style and length of the caption depend on your chosen length parameter (short, normal, or long).

💡 Best Practices

• Use “short” for quick summaries or thumbnail text.
• Use “normal” for descriptive captions (recommended default).
• Use “long” for storytelling, research annotations, or dataset labeling.
• Supported formats: JPEG, PNG, WebP
• Maximum image size: 10 MB

💰 Pricing

• $0.005 per request
• Contact WaveSpeedAI for enterprise and large-scale pricing options.

# Submit the task
curl --location --request POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/moondream3-preview/caption" \
--header "Content-Type: application/json" \
--header "Authorization: Bearer ${WAVESPEED_API_KEY}" \
--data-raw '{
    "length": "normal",
    "enable_sync_mode": true
}'

# Get the result
curl --location --request GET "https://api.wavespeed.ai/api/v3/predictions/${requestId}/result" \
--header "Authorization: Bearer ${WAVESPEED_API_KEY}"