# Moondream 3.1

> Moondream 3.1 is an open-weight language model from Moondream, released on 15 Oct 2026. It accepts text and images and generates text, with a 32K-token context window and up to 4K output tokens per response. As of 17 Oct 2026, the lowest listed API price is $0.30 per million input tokens and $2.50 per million output tokens (OpenRouter), across 1 provider we track.

Source page: https://www.aimodel.directory/models/moondream3-1-9b-a2b
Last verified: 17 Oct 2026

## Specifications

- **Developer:** Moondream
- **Release date:** 15 Oct 2026 (source: OpenRouter, https://openrouter.ai/moondream/moondream3.1-9b-a2b)
- **Status:** Generally available
- **Weights:** Open weights (source: Hugging Face, https://huggingface.co/moondream/moondream3.1-9B-A2B)
- **License:** moondream-model-license-1.0 (source: Hugging Face, https://huggingface.co/moondream/moondream3.1-9B-A2B)
- **Parameters:** 9.3B (source: Hugging Face, https://huggingface.co/moondream/moondream3.1-9B-A2B)
- **Context window:** 32K (32,000 tokens) (source: OpenRouter, https://openrouter.ai/moondream/moondream3.1-9b-a2b)
- **Max output:** 4K tokens (source: OpenRouter, https://openrouter.ai/moondream/moondream3.1-9b-a2b)
- **Input:** Text and images (source: OpenRouter, https://openrouter.ai/moondream/moondream3.1-9b-a2b)
- **Output:** Text (source: OpenRouter, https://openrouter.ai/moondream/moondream3.1-9b-a2b)
- **Reasoning mode:** Yes (source: OpenRouter, https://openrouter.ai/moondream/moondream3.1-9b-a2b)
- **Tool calling:** No (source: OpenRouter, https://openrouter.ai/moondream/moondream3.1-9b-a2b)
- **Structured output:** No (source: OpenRouter, https://openrouter.ai/moondream/moondream3.1-9b-a2b)
- **Hugging Face:** moondream/moondream3.1-9B-A2B (source: Hugging Face, https://huggingface.co/moondream/moondream3.1-9B-A2B)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| OpenRouter | $0.30 | $2.50 | – | 32K |

## FAQ

### What is the context window of Moondream 3.1?

Moondream 3.1 has a context window of 32,000 tokens (32K) and can generate up to 4,096 tokens in a single response, according to OpenRouter.

### How much does the Moondream 3.1 API cost?

Moondream 3.1 is listed from $0.30 per million input tokens and $2.50 per million output tokens (OpenRouter). Prices last verified 17 Oct 2026.

### Is Moondream 3.1 open source?

Moondream 3.1 is an open-weight model: its weights are published on Hugging Face as moondream/moondream3.1-9B-A2B under the moondream-model-license-1.0 license. Check the license terms before commercial use.

### When was Moondream 3.1 released?

Moondream released Moondream 3.1 on 15 Oct 2026, according to OpenRouter.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "Moondream 3.1", https://www.aimodel.directory/models/moondream3-1-9b-a2b