Meta releases Muse Spark Open weights: 816B parameters, 42B active
It reads a 1M-token context and ships under the Muse Model License on Hugging Face.
Meta, language model
Muse Spark
Released Apr 8, 2026. Scored on 2 boards.
1489LMArena textRank 13 of 38
- Released
- Apr 8, 2026
- Price, in / out
- n/a
- per 1M tokens, list price
- Blended price
- n/a
- 3 input tokens per output token
- Output speed
- n/a
- Context
- n/a
- Open weights
- No
Scores
The latest published score on each board, ranked against every model we track. Each score links to its source.
| Board | Score | Rank | Record | Date | Source | Readings |
|---|---|---|---|---|---|---|
| LMArena textOverall | 1489style control | 13 of 38 | 1524Gemini 4 Argon | Oct 20, 2026 | huggingface.co | 1 |
| Humanity's Last ExamReasoning and knowledge | 40.6% | 7 of 14 | 54.8%GPT-6 Astra | Apr 8, 2026 | epoch.ai | 1 |
Compare with
The closest models on the boards they share with Muse Spark.
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