Molmo2 Image Captioner

Playground

Molmo2-4B Image Captioner: Generate detailed, accurate captions for images with customizable detail levels (low, medium, high). Open-source vision-language model with object grounding capabilities. Ready-to-use REST API, no cold starts, affordable pricing.

Features

Molmo2 Image Captioner

Molmo2 Image Captioner is an intelligent image understanding model that generates detailed captions and descriptions for any image. Upload an image and receive natural-language descriptions of scenes, objects, people, and context — with adjustable detail levels to match your workflow needs.

Perfect for content creators, accessibility teams, and developers building image understanding pipelines.

Why Choose This?

Adjustable detail levels Choose from low, medium, or high detail to control caption depth — from quick summaries to comprehensive scene breakdowns.
Rich visual understanding Understands context, objects, people, text, environments, and spatial relationships to produce coherent, meaningful descriptions.
Flexible image input Accepts image uploads or public URLs for seamless integration into existing workflows.
Fast and affordable Optimized for quick turnaround at just $0.002 per image.
Production-ready API Ready-to-use REST endpoint with simple flat-rate pricing and no cold starts.

Parameters

Parameter	Required	Description
image	Yes	Input image (upload or public URL)
detail_level	No	Caption detail: low, medium (default), or high

Detail Level Options

Low — Brief, high-level summary of the image content
Medium — Balanced description with key elements and context (default)
High — Comprehensive breakdown with fine-grained details

How to Use

Upload your image — drag and drop a file or paste a public image URL.
Select detail level — choose low, medium, or high based on your needs.
Submit — the model processes the image and returns a caption.
Use the output — integrate captions into your content, accessibility tools, or data pipelines.

Pricing

Item	Cost
Per image	$0.002

Simple flat-rate pricing — no hidden fees or complex calculations.

Best Use Cases

Accessibility — Generate image descriptions for visually impaired users and screen readers.
Content indexing — Create searchable metadata for image libraries and archives.
Social media — Auto-generate alt text and captions for posts.
Image SEO — Improve discoverability with rich text descriptions for visual content.
E-commerce — Automatically describe product images for catalogs.
Education — Describe visual materials for enhanced learning resources.

Notes

If using a URL, ensure it is publicly accessible. A preview thumbnail in the interface confirms successful access.
Clear, well-lit images yield the most accurate captions.
Use high detail level for complex scenes; low detail for quick overviews.
Supports common image formats including JPEG, PNG, and WebP.

Authentication

For authentication details, please refer to the Authentication Guide.

API Endpoints

Submit Task & Query Result


# Submit the task
curl --location --request POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/molmo2/image-captioner" \
--header "Content-Type: application/json" \
--header "Authorization: Bearer ${WAVESPEED_API_KEY}" \
--data-raw '{
    "detail_level": "medium",
    "enable_sync_mode": false
}'

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

Parameters

Task Submission Parameters

Request Parameters

Parameter	Type	Required	Default	Range	Description
image	string	Yes		-	Input image URL for captioning. Supports common image formats (JPEG, PNG, WebP).
detail_level	string	No	medium	low, medium, high	Level of detail in the generated caption. Low: brief summary. Medium: balanced description. High: comprehensive, detailed analysis.
enable_sync_mode	boolean	No	false	-	If set to true, the function will wait for the result to be generated and uploaded before returning the response. It allows you to get the result directly in the response. This property is only available through the API.

Response Parameters

Parameter	Type	Description
code	integer	HTTP status code (e.g., 200 for success)
message	string	Status message (e.g., “success”)
data.id	string	Unique identifier for the prediction, Task Id
data.model	string	Model ID used for the prediction
data.outputs	array	Array of URLs to the generated content (empty when status is not `completed`)
data.urls	object	Object containing related API endpoints
data.urls.get	string	URL to retrieve the prediction result
data.has_nsfw_contents	array	Array of boolean values indicating NSFW detection for each output
data.status	string	Status of the task: `created`, `processing`, `completed`, or `failed`
data.created_at	string	ISO timestamp of when the request was created (e.g., “2023-04-01T12:34:56.789Z”)
data.error	string	Error message (empty if no error occurred)
data.timings	object	Object containing timing details
data.timings.inference	integer	Inference time in milliseconds

Result Request Parameters

Parameter	Type	Required	Default	Description
id	string	Yes	-	Task ID

Result Response Parameters

Parameter	Type	Description
code	integer	HTTP status code (e.g., 200 for success)
message	string	Status message (e.g., “success”)
data	object	The prediction data object containing all details
data.id	string	Unique identifier for the prediction, the ID of the prediction to get
data.model	string	Model ID used for the prediction
data.outputs	string	Array of URLs to the generated content (empty when status is not completed).
data.urls	object	Object containing related API endpoints
data.urls.get	string	URL to retrieve the prediction result
data.status	string	Status of the task: `created`, `processing`, `completed`, or `failed`
data.created_at	string	ISO timestamp of when the request was created (e.g., “2023-04-01T12:34:56.789Z”)
data.error	string	Error message (empty if no error occurred)
data.timings	object	Object containing timing details
data.timings.inference	integer	Inference time in milliseconds

Mmaudio V2 Molmo2 Image Content Moderator