Muse Spark Open is an 816B total / 42B active open-weight multimodal reasoning model from Meta for coding and long-horizon agentic work, with 1M-token context.
Muse Spark Open is a coding-optimized open-weight model. Trained specifically for agentic coding workflows, it delivers higher first-attempt accuracy, reliable tool calling, and deep codebase understanding across the repos developers...
Context
1.05M
1,048,576 tokens
Max output
131K
131,072 tokens
Input
$1.25
per 1M tokens
Output
$4.25
per 1M tokens
Providers
14
15 listings
Intelligence
—
Not yet scored
Pricing
USD per 1M tokens · listed by Together AI
| Token type | Standard |
|---|---|
| Input | $1.25 |
| Output | $4.25 |
| Cache read | $0.15 |
Lowest input price across providers: $1.25.
Capabilities
Effort: none, low, medium, high, xhigh
Field: reasoning_content
Input
Output
Benchmarks
Published scores and Design Arena Elo
- IntelligenceNot scored—
- CodingNot scored—
- AgenticNot scored—
- Arena1,305#8 of 128
| Design Arena category | Elo | Win rate | Arena rank |
|---|---|---|---|
| UI component | 1,338 | 59.0% | #9 |
| Website | 1,310 | 55.5% | #11 |
| Code | 1,301 | 53.9% | #16 |
| Game dev | 1,269 | 49.8% | #26 |
Rankings
Position on each OneAtlas leaderboard
Providers · 14
15 listings
Together AI
NanoGPT
Vercel AI Gateway
Kilo Gateway
Eden AI
Merge GatewayRequesty
Venice AI
Cloudflare AI Gateway
Prime Inference
Fireworks AI
Nebius Token Factory
Ollama Cloud
Modal| Provider | Model ID | Context | Input limit | Output | Input $ | Output $ | Reasoning $ | Cache read | Cache write | Audio in | Audio out | Reasoning | Tools | Structured | Temp. | Updated |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloudflare AI Gateway | meta/muse-spark-open | 1.04M | — | 131K | $1.25 | $4.25 | — | $0.15 | — | — | — | Yes | Yes | Yes | Yes | Oct 15, 2026 |
| Eden AI | nebius/meta-models/muse-spark-open | 1.05M | — | 131K | $1.25 | $4.25 | — | $1.25 | — | — | — | Yes | Yes | No | Yes | Oct 15, 2026 |
| Eden AI | fireworks_ai/accounts/fireworks/models/muse-spark-open | 1.05M | — | 131K | $1.25 | $4.25 | — | $0.15 | — | — | — | Yes | Yes | Yes | Yes | Oct 15, 2026 |
| Fireworks AI | accounts/fireworks/models/muse-spark-open | 1.05M | — | 131K | $1.25 | $4.25 | — | $0.15 | — | — | — | Yes | Yes | Yes | Yes | Oct 15, 2026 |
| Kilo Gateway | meta/muse-spark-open | 1.05M | — | 944K | $1.25 | $4.25 | — | $0.15 | — | — | — | Yes | Yes | Yes | Yes | Oct 15, 2026 |
| Merge Gateway | meta/muse-spark-open | 1.05M | — | 262K | $1.25 | $4.25 | — | $0.15 | — | — | — | Yes | Yes | No | Yes | Oct 15, 2026 |
| Modal | meta-models/Muse-Spark-Open-816B-A42B | 1.05M | — | 131K | $1.25 | $4.25 | — | $0.15 | — | — | — | Yes | Yes | Yes | Yes | Oct 15, 2026 |
| NanoGPT | meta/muse-spark-open | 1.05M | 1.05M | 131K | $1.25 | $4.25 | — | $0.15 | — | — | — | Yes | Yes | Yes | Yes | Oct 15, 2026 |
| Nebius Token Factory | meta-models/muse-spark-open | 1.05M | — | 1.05M | $1.25 | $4.25 | — | $0.15 | — | — | — | Yes | Yes | Yes | Yes | Oct 15, 2026 |
| Ollama Cloud | muse-spark-open | 1.05M | — | 131K | $1.25 | $4.25 | — | $0.15 | — | — | — | Yes | Yes | No | Yes | Oct 15, 2026 |
| Prime Inference | meta/muse-spark-open | 1.05M | — | 944K | $1.25 | $4.25 | — | — | — | — | — | Yes | Yes | Yes | Yes | Oct 15, 2026 |
| Requesty | muse-spark-open | 1.05M | — | 131K | $1.25 | $4.25 | — | $0.15 | — | — | — | Yes | Yes | No | Yes | Oct 15, 2026 |
| Together AI | meta-models/Muse-Spark-Open-816B-A42B | 1.05M | — | 131K | $1.25 | $4.25 | — | $0.15 | — | — | — | Yes | Yes | Yes | Yes | Oct 15, 2026 |
| Venice AI | muse-spark-open | 1.05M | — | 131K | $1.56 | $5.31 | — | $0.19 | — | — | — | Yes | Yes | Yes | Yes | Oct 15, 2026 |
| Vercel AI Gateway | meta/muse-spark-open | 1.05M | — | 1.05M | $1.25 | $4.25 | — | $0.15 | — | — | — | Yes | Yes | Yes | Yes | Oct 15, 2026 |