# Muse Spark Open

Model tracker · checked 2026-10-15 · https://dbggr.dev/models/muse-spark-open/

Muse Spark Open is an everyday open-weight model from Meta, released 15 October 2026. At Together AI it costs $1.25 per million input tokens and $4.25 per million output tokens, with a 1M-token context window.

- Made by: Meta Platforms
- Released: 2026-10-15
- Status: Generally available, new
- Tier: Everyday
- Weights: Open
- Context window: 1,048,576 tokens
- Input: text, image, audio, video
- API id: meta-models/Muse-Spark-Open-816B-A42B
- Docs: https://huggingface.co/meta-models/Muse-Spark-Open-816B-A42B

## Muse Spark Open price at Together AI

US dollars per million tokens. Blended is 3 input tokens for every output token, one number to compare on.

| Provider | Input | Output | Cached input | Blended | Batch | Checked |
|---|---|---|---|---|---|---|
| Together AI | $1.25 | $4.25 | $0.15 | $2.00 | – | [2026-10-15](https://www.together.ai/pricing) |

- Together AI: Open weights (816B total, 42B active), gated download, under Meta's Muse Model License: model-as-a-service providers above $20M revenue need a separate agreement with Meta. Same list price on Fireworks, Baseten and Nebius via OpenRouter at launch.

## Muse Spark Open benchmarks

| Benchmark | Score | What it measures | Reported by |
|---|---|---|---|
| GPQA Diamond | 89% | graduate-level science questions answered correctly | [Meta](https://huggingface.co/meta-models/Muse-Spark-Open-816B-A42B) |

Scores reported by a model's maker aren't independently checked.

## Models like Muse Spark Open

| Model | Input | Output | Context | Weights |
|---|---|---|---|---|
| Muse Spark Open | $1.25 | $4.25 | 1M | Open |
| [Muse Spark 1.3](https://dbggr.dev/models/muse-spark-1-3/) | $1.25 | $4.25 | 1M | Closed |
| [DeepSeek V4 Pro](https://dbggr.dev/models/deepseek-v4-pro/) | $1.32 | $3.96 | 1M | Open |
| [GLM-5.3](https://dbggr.dev/models/glm-5-3/) | $1.40 | $4.40 | 1M | Open |
| [Step 5 Preview](https://dbggr.dev/models/step-5-preview/) | $1.00 | $2.70 | 1M | Closed |
| [Qwen3.8 Max](https://dbggr.dev/models/qwen3-8-max/) | $2.00 | $6.00 | 1M | Open |

## FAQ

### How much does Muse Spark Open cost?

Muse Spark Open costs $1.25 per million input tokens and $4.25 per million output tokens at Together AI, and $0.15 per million cached input tokens. Prices are list prices in US dollars, last checked 15 October 2026.

### What is Muse Spark Open's context window?

Muse Spark Open takes up to 1,048,576 tokens in one request.

### Is Muse Spark Open open weight?

Yes. Meta publishes the weights, so you can run Muse Spark Open yourself or at any host that serves it.

### Where can I use Muse Spark Open?

Muse Spark Open is available from Together AI. At Together AI, call it as `meta-models/Muse-Spark-Open-816B-A42B`.