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Step 5 Preview
Muse Spark Open
Muse Spark Open is an open-weight model from Meta, released Oct 15, 2026. It ranks #23 of 27 on the Vals Index with 48.57%. It costs $1.25 per million input tokens and $4.25 per million output tokens, with a 1M-token context window.
- Developer
- Meta
- Released
- Oct 15, 2026
- Context window
- 1M
- Price in / out, per 1M tokens
- $1.25 / $4.25
- Weights
- Open · muse-model-license
- Inputs
- Text, Images, Video, Files, Audio
- Reasoning
- Yes
- Tool use
- Yes
- Hugging Face downloads, 30 days
- 6.8K
- Hugging Face likes
- 686
Benchmarks
| Benchmark | Score bar | Accuracy | Rank | Cost / test |
|---|---|---|---|---|
| Vals IndexVals AI | 48.57% | 23 / 27 | $4.72 | |
| Terminal-Bench 4.0Coding | 6.57% | 44 / 55 | $7.26 | |
| Vibe Code BenchCoding | 76.19% | 36 / 115 | $1.66 | |
| Code MigrationCoding | 26.89% | 24 / 28 | $3.77 | |
| Finance AgentFinance | 60.66% | 17 / 31 | $2.76 | |
| Finance IndexFinance | 52.99% | 25 / 31 | $3.00 | |
| Tax Agent BenchFinance | 26.32% | 37 / 76 | $0.88 | |
| Legal IndexLaw | 68.51% | 18 / 28 | $5.36 | |
| Legal Research BenchLaw | 38.46% | 37 / 85 | $1.56 |
Vals AI, as of Oct 24, 2026.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| WebDevLMArena | 1526 | 53 / 124 | 1.5K |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown.
Compare Muse Spark Open
Meta
Meta’s AI research publishes the Llama family, among the most downloaded open-weight models. Founded 2013 (FAIR), based in Menlo Park. ai.meta.com
Questions
Who makes Muse Spark Open?
Muse Spark Open is made by Meta, founded 2013 (FAIR) and based in Menlo Park.
How much does Muse Spark Open cost?
$1.25 per million input tokens and $4.25 per million output tokens, at its provider’s list price.
What is Muse Spark Open’s context window?
1M tokens (1,048,576).
Is Muse Spark Open open source?
Muse Spark Open has open weights under the muse-model-license license, downloadable from Hugging Face (meta-models/Muse-Spark-Open-816B-A42B).