Meta, open weights
Muse Spark Open
Muse Spark Open by Meta ranks 26th of 357 ranked models on the Noometry Index as of October 2026, with a score of 55.2. Its strongest category is math, where it ranks 25th. API pricing starts at $1.25 per million input tokens and $4.25 per million output tokens, with a 1.05M-token context window.
Last verified
Specifications
- Noometry rank
- #26 of 357
- Index score
- 55.2
- Evidence
- Reported 5 results
- Provider
Meta- Released
- October 15, 2026
- Weights
- Open weights
- Reasoning
- Yes
- Context window
- 1.05M
- Max output
- 131K
- Input price
- $1.25 / M
- Output price
- $4.25 / M
- Blended price
- $2 / M
- Output speed
- Not measured
- Value
- #139 of 222
- Knowledge cutoff
- January 2026
- Input
- text, image
- Hugging Face
- meta-models/Muse-Spark-Open-816B-A42B
Category scores
Each category score combines every public result we have in that category.
- Math 68.6
- Knowledge 60.1
Strengths and weaknesses
Categories where Muse Spark Open places highest and lowest among the models ranked in each, with its score against that category's median.
Closest competitors
The models ranked just above and below Muse Spark Open. When scores are this close, price and speed are often the better way to choose.
| Model | Rank | Score | Blended $/M | Speed | |
|---|---|---|---|---|---|
| Qwen3.8 Max | #22 | 56.9 | $3 | — | Compare |
| Grok 4.6 | #23 | 56.8 | $3 | — | Compare |
| Gemini 3.1 Pro Preview | #24 | 56.7 | $4.50 | — | Compare |
| GLM-5.3 | #25 | 55.3 | $2.15 | — | Compare |
| Grok 4.5 | #27 | 55.0 | $3 | 4 | Compare |
| Muse Wonder | #28 | 55.0 | $8 | — | Compare |
| DeepSeek V4.1 Flash | #29 | 55.0 | $0.26 | — | Compare |
| Claude Sonnet 5 | #30 | 54.9 | $4 | — | Compare |
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Benchmark results
Every published result we track, with its source. Bold rows are the ones used for ranking; where several exist we prefer independent runs over self-reported numbers.
Math
| Benchmark | Score | Position | Setting | Source | Date |
|---|---|---|---|---|---|
| FrontierMath (Tiers 1-3) | 69.8% | #27 of 85, top 32% | xhigh | Epoch AI | 2026-10-15 |
| FrontierMath Tier 4 | 31.7% | #30 of 67, top 45% | xhigh | Epoch AI | 2026-10-15 |
| OTIS Mock AIME 2024-2025 | 98.1% | #27 of 177, top 16% | xhigh | Epoch AI | 2026-10-15 |
Knowledge
| Benchmark | Score | Position | Setting | Source | Date |
|---|---|---|---|---|---|
| GPQA Diamond | 88.6% | #47 of 189, top 25% | xhigh | Epoch AI | 2026-10-15 |
| SimpleQA Verified | 56.6% | #19 of 80, top 24% | xhigh | Epoch AI | 2026-10-15 |
API pricing by provider
| Route | Input $/M | Output $/M | Cached input $/M | Checked |
|---|---|---|---|---|
| fireworks | $1.25 | $4.25 | $0.15 | 2026-10-16 |
| openrouter | $1.25 | $4.25 | $0.15 | 2026-10-16 |
Compare Muse Spark Open
- Muse Spark Open vs GLM-5.3
- Muse Spark Open vs Grok 4.5
- Muse Spark Open vs Gemini 3.1 Pro Preview
- Muse Spark Open vs Muse Wonder
- Muse Spark Open vs Grok 4.6
- Muse Spark Open vs DeepSeek V4.1 Flash
- Muse Spark Open vs GPT-6 Astra
- Muse Spark Open vs Claude Opus 5.5
- Muse Spark Open vs Gemini 4 Argon
- Muse Spark Open vs Kimi K3
- Muse Spark Open vs Qwen3.8 Max
- Muse Spark Open vs MiMo-V2.6-Pro
Other Meta models
- Muse Wonder55.0
- Muse Spark 1.354.8
- Muse Spark50.8
- Muse Spark 1.250.6
- Muse Spark 1.150.4
- Muse Glimmer42.0
- Codellama 70b Instruct34.0
- Codellama 34b Instruct31.0
Frequently asked questions
How good is Muse Spark Open?
Muse Spark Open by Meta ranks 26th of 357 ranked models on the Noometry Index as of October 2026, with a score of 55.2. Its strongest category is math, where it ranks 25th. API pricing starts at $1.25 per million input tokens and $4.25 per million output tokens, with a 1.05M-token context window.
How much does Muse Spark Open cost?
Muse Spark Open costs $1.25 per million input tokens and $4.25 per million output tokens on fireworks, with cached input at $0.15.
What is Muse Spark Open's context window?
Muse Spark Open accepts up to 1.05M tokens of input and can write up to 131K tokens in one response.
Is Muse Spark Open open source?
Yes. Muse Spark Open's weights are downloadable from Hugging Face (meta-models/Muse-Spark-Open-816B-A42B); check the license for commercial terms.
What are Muse Spark Open's strengths and weaknesses?
Relative to other ranked models, Muse Spark Open places best in math and lowest in knowledge.
What is Muse Spark Open best at?
Its best category is math, where it ranks 25th on Noometry.