Muse Spark Open
- Family
- Muse
- Released
- 2026-10-15
- Context
- 1M
- Parameters
- 816B (42B activated)
- Architecture
- Mixture of Experts
- Specialization
- coding
- Openness
- Open weights
- License
- Muse Model LicenseCommercial use: conditional
- Weights
- Available
- Code
- Unknown
Large-scale open-source AI for social technologies.
Cheapest of 4 routes · Fireworks AI · cache read $0.150
About
Muse Spark Open is the open-weight release of Meta Superintelligence Labs' Muse Spark, an 816-billion-parameter mixture-of-experts model that activates about 42 billion parameters per token. Released October 15, 2026 under the Muse Model License, it is built for coding and agentic work, takes text, image, video and audio input, returns text, and has a 1M-token context window. Weights are on Hugging Face in BF16 and NVFP4.
Providers(4)
Compare all 4Compare API pricing across 4 tracked provider routes for input and output tokens, batch, and cached reads when available.
| Provider | Input / 1M | Output / 1M | Cache | Route |
|---|---|---|---|---|
| Fireworks AI | $1.25 | $4.25 | read $0.150 | Serverless |
| Together AI | $1.25 | $4.25 | read $0.150 | Serverless |
| GroqCloud | Contact sales | Contact sales | - | Serverless |
| OpenRouter | - | - | - | ServerlessPartial |
Available via routers & gateways(1)
Capabilities
Benchmark peer barsfor Coding
No task-mapped benchmark peers are available for this model yet.
Benchmark scores(9)
| Benchmark | Score | Version | Evaluation | Source |
|---|---|---|---|---|
| Google-Proof Q&A | 89.0 | GPQA Diamond; xhigh reasoning effortObserved 2026-10-15 | — | Source |
| Humanity's Last Exam — With Tools | 61.0 | HLE (w/ tools); xhigh reasoning effortObserved 2026-10-15 | — | Source |
| MCP-Atlas | 89.2 | MCP-Atlas; xhigh reasoning effortObserved 2026-10-15 | — | Source |
| OSWorld-Verified | 80.4 | OSWorld Verified; xhigh reasoning effortObserved 2026-10-15 | — | Source |
| Toolathlon | 72.8 | Toolathlon Verified; xhigh reasoning effortObserved 2026-10-15 | — | Source |
| DeepSWE 1.1 | 60.0 | DeepSWE 1.1, preferred harness; xhigh reasoning effortObserved 2026-10-15 | — | Source |
| Terminal-Bench 2.1 | 76.4 | Terminal-Bench 2.1, Terminus 2 agent; xhigh reasoning effortObserved 2026-10-15 | — | Source |
| BabyVision w/ tools | 80.2 | BabyVision (w/ tools); xhigh reasoning effortObserved 2026-10-15 | — | Source |
| WorldVQA | 49.4 | WorldVQA (w/ tools); xhighObserved 2026-10-15 | — | Source |
Migration checks
No linked migration route is available for this model yet.
API versions
meta-models/Muse-Spark-Open-816B-A42Bmeta-models/Muse-Spark-Open-816B-A42B-NVFP4Large-scale open-source AI for social technologies.
Cheapest of 4 routes · Fireworks AI · cache read $0.150