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Step 5 Preview
Muse Spark 1.3 Max
Muse Spark 1.3 Max is a proprietary model from Meta. Its best result is #1 of 85 on Legal Research Bench with 55.29%.
- Developer
- Meta
- Released
- Sep 13, 2026
- Context window
- —
- Price in / out, per 1M tokens
- —
- Weights
- Proprietary
- Inputs
- —
- Reasoning
- —
- Tool use
- —
LatestMuse Spark 1.3 Max 1490
The rating LMArena published at each update since Sep 13, 2026. Ratings move as votes come in and new models join.
Benchmarks
| Benchmark | Score bar | Accuracy | Rank | Cost / test |
|---|---|---|---|---|
| Terminal-Bench 4.0Coding | 24.75% | 25 / 55 | $6.65 | |
| Vibe Code BenchCoding | 85.86% | 14 / 115 | $2.54 | |
| Tax Agent BenchFinance | 42.44% | 8 / 76 | $0.39 | |
| Legal Research BenchLaw | 55.29% | 1 / 85 | $0.59 | |
| Terminal-Bench ScienceReasoning | 10.00% | 15 / 42 | $6.09 |
Vals AI, as of Oct 24, 2026.
Compare Muse Spark 1.3 Max
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 1.3 Max?
Muse Spark 1.3 Max is made by Meta, founded 2013 (FAIR) and based in Menlo Park.
Is Muse Spark 1.3 Max open source?
No. Muse Spark 1.3 Max is proprietary and served through its provider’s API.