moondream3-1-9b-a2b
Moondream 3.1 is a vision-language model from Moondream and the successor to Moondream 3 Preview, a 9B mixture-of-experts with 2B active parameters for visual question answering, captioning, OCR and visual reasoning.
Pricing: Input 72 credits / 1M tokens (≈ $0.36), Output 600 credits / 1M tokens (≈ $3.00).
Prices updated
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Moondream 3.1 API on ModelFold
Moondream 3.1 is a vision-language model from Moondream and the successor to Moondream 3 Preview, a 9B mixture-of-experts with 2B active parameters for visual question answering, captioning, OCR and visual reasoning. Try Moondream 3.1 in the ModelFold Playground, then call it from your own code through an OpenAI-compatible chat completions API.
What Is the Moondream 3.1 API
Moondream 3.1 at a glance
Moondream 3.1 is a chat model from Moondream. It accepts text and images as input and returns text, with a context window of up to 32K tokens.
Use it without hosting anything
On ModelFold you call Moondream 3.1 with a single API key — no model weights to download and no inference servers to run. The same key also works for the other chat, image, video and audio models on ModelFold.
Core Capabilities of Moondream 3.1
Up to 32K tokens of context
Keep long conversations, large documents and sizeable code in a single request, so the model can reason over the full material instead of fragments.
Understands images
Besides text, Moondream 3.1 accepts images as input, so a single request can combine instructions with visual or other media.
Reasoning mode
Moondream 3.1 can produce reasoning before its final answer; in the Playground you can switch reasoning on or off to compare results.
How to Use Moondream 3.1 on ModelFold
- 1
Step 1: Try it in the Playground
Open the Playground at the top of this page, type a prompt and see how Moondream 3.1 responds before writing any code.
- 2
Step 2: Create an API key
Sign in to ModelFold and create an API key in the console. Keep it secret and send it as a Bearer token.
- 3
Step 3: Send a request
Call POST https://modelfold.ai/v1/chat/completions with "model": "moondream3-1-9b-a2b" and your messages. Existing OpenAI-compatible SDKs work by changing the base URL and key.
- ✓
Step 4: Ship and monitor
Integrate the response into your product and check token usage and spend for every call in the console logs.
What You Can Build with Moondream 3.1
Screenshot and image understanding
Read screenshots, charts, diagrams and photos alongside text — for UI review, visual QA or turning images into structured data.
High-volume pipelines
Run classification, extraction, rewriting and batch jobs at scale where cost per request matters.
Long-document workflows
Feed in long reports, contracts, manuals or codebases and ask for summaries, comparisons and answers grounded in the material.
Frequently Asked Questions
What is Moondream 3.1?⌄
Moondream 3.1 is a vision-language model from Moondream and the successor to Moondream 3 Preview, a 9B mixture-of-experts with 2B active parameters for visual question answering, captioning, OCR and visual reasoning.
Which inputs does Moondream 3.1 support?⌄
Moondream 3.1 accepts text and images and returns text. Through ModelFold you can send text and images (OpenAI-style image_url content); in the Playground you can also attach documents, which are converted to text.
How long is the context window of Moondream 3.1?⌄
Up to 32K tokens, shared between your input and the model’s output.
Does Moondream 3.1 support function calling?⌄
Function calling is not listed for Moondream 3.1; requests that include tools will be rejected. Use plain prompts or JSON output instead.
How is Moondream 3.1 billed on ModelFold?⌄
Pay as you go by tokens: input and output tokens are charged at the per-million-token prices shown on this page. There is no monthly fee, and failed requests are not charged.
How do I call Moondream 3.1 through the API?⌄
Send a POST request to https://modelfold.ai/v1/chat/completions with "model": "moondream3-1-9b-a2b", using your ModelFold API key as the Bearer token.
| Input | 72 credits 1M tokens≈ $0.36 |
| Output | 600 credits 1M tokens≈ $3.00 |
Billed per token: input and output are priced separately, and thinking tokens count as output. The Playground charges exactly the same way.
Read API docs →AI Agents · Claude Code / Cursor / Trae →curl https://modelfold.ai/v1/chat/completions \
-H "Authorization: Bearer $MODELFOLD_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"moondream3-1-9b-a2b","messages":[{"role":"user","content":"Hello"}]}'