Moondream 3.1
Summary
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.
Moondream 3.1 is a vision-language model from Moondream, the successor to Moondream 3 Preview, with 9B total parameters and 2B active (mixture-of-experts). It handles visual question answering, captioning, OCR, and...
Last verified 17 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | Moondream |
|---|---|
| Release date | 15 Oct 2026 [OpenRouter] |
| Status | Generally available |
| Weights | Open weights [Hugging Face] |
| License | moondream-model-license-1.0 [Hugging Face] |
| Parameters | 9.3B [Hugging Face] |
| Context window | 32K (32,000 tokens) [OpenRouter] |
| Max output | 4K tokens [OpenRouter] |
| Input | Text and images [OpenRouter] |
| Output | Text [OpenRouter] |
| Reasoning mode | Yes [OpenRouter] |
| Tool calling | No [OpenRouter] |
| Structured output | No [OpenRouter] |
| Hugging Face | moondream/moondream3.1-9B-A2B [Hugging Face] |
Moondream 3.1 API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| OpenRouter moondream/moondream3.1-9b-a2b | $0.30 | $2.50 | – | 32K | OpenRouter, 17 Oct 2026 |
Running Moondream 3.1 locally
Estimated memory, from the parameter count on Hugging Face. Includes about 0.8 GB of runtime overhead.
| Quantization | Weights | Total, 8K context | Total, 32K context |
|---|---|---|---|
| Q4_K_M (4-bit) | 5.6 GB | 6.4 GB | – |
| Q8_0 (8-bit) | 9.9 GB | 11 GB | – |
| FP16 / BF16 (16-bit) | 19 GB | 19 GB | – |
At 4-bit with an 8K conversation, Moondream 3.1 needs about 6.4 GB, so it fits on a graphics card with 8 GB or more, such as the NVIDIA GeForce RTX 4060 8 GB. The model's architecture is not public, so the conversation cache is not included. Check your own hardware.
Frequently asked questions
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.
How much VRAM does Moondream 3.1 need?
About 6.4 GB at 4-bit (Q4_K_M) with an 8K-token conversation, and about 11 GB at 8-bit. The 4-bit model fits on a graphics card with 8 GB or more, such as the NVIDIA GeForce RTX 4060 8 GB. These are estimates from the model's published parameter count.
Change history
- License changed from none to moondream-model-license-1.0
- Parameter count changed from none to 9.3B
- Added to the directory
- Now listed on OpenRouter