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Muse Spark Open vs Muse Spark 1.3
Muse Spark 1.3 scores higher than Muse Spark Open on all 3 public leaderboards that rate both. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Muse Spark Open is at 16.7 and Muse Spark 1.3 at 58.9 (out of 100).
Scores as published by each board; table composed November 13, 2026.
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Leaderboard by leaderboard
| Board | Muse Spark Open | Muse Spark 1.3 | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,526.3 | 1,655.1 | Muse Spark 1.3 |
| LiveBench global average (0-100) | 48.5 | 68.6 | Muse Spark 1.3 |
| Epoch AI Epoch Capabilities Index (ECI) · many benchmarks on one scale | 155.4 | 158.2 | Muse Spark 1.3 |
Raw scores are each board's own scale, so compare within a row, not across rows. Full table: the bench index.
For coding
On the ArtificialWatch coding index, Muse Spark Open is at 21.6 (#43 of 48) and Muse Spark 1.3 at 74.4 (#11). Muse Spark 1.3 scores higher on both coding boards that rate them.
| Coding board | Muse Spark Open | Muse Spark 1.3 |
|---|---|---|
| LiveBench · Coding | 55.1 | 84.4 |
| Vals Vibe Code Bench | 76.2 | 85.9 |
Muse Spark Open at a glance
- Developer
- Meta
- Status
- Live since October 15, 2026
Live — Oct 15 · Meta's open-weights Spark: 816B total / 42B active mixture-of-experts with a 1.8B perception encoder, 1M context, text, image, video and audio in, text out · reasoning effort low / medium / high / xhigh, default xhigh · weights on Hugging Face in BF16 and NVFP4, gated, under Meta's Muse Model License · Meta says NVFP4 needs at least 700GB of VRAM and BF16 2TB, and that it is tuned to run on two M5 Ultra Mac Studios with MLX · OpenRouter: $1.25 / $4.25 per 1M through BaseTen (FP4), the same price as Muse Spark 1.3 · Meta's own table, against open-weight models: Artificial Analysis Intelligence Index 39, behind GLM 5.3 (45), Kimi K3 (44) and Qwen3.8 (40); ahead of all of them on JobBench (61.8) and MCP-Atlas (89.2); behind on Terminal-Bench 2.1 (76.4 vs Kimi K3's 85.0) · Artificial Analysis has no page of its own for it yet (Oct 15).
Meta releases Muse Spark Open: 816B open weights at $1.25 / $4.25, and its own table puts it behind Kimi K3 and GLM 5.3
2026-10-15 · Meta has released Muse Spark Open, an open-weights version of its Spark model: 816 billion parameters in total, 42 billion active per token, with a 1M-token context. Meta's model card on Hugging Face dates the release October 15.
Muse Spark 1.3 at a glance
- Developer
- Meta
- Status
- Live since September 2, 2026
- API price
- $1.25 input / $4.25 output per 1M tokens · Meta, muse-spark-1.3
- Context window
- 1.05M tokens
Live — Sep 2 · $1.25/$4.25 per 1M and 1M ctx, identical to 1.2 · Meta: ~20% fewer tool calls, ~25% fewer tokens vs 1.2 · open weights on the roadmap, undated · the open-weights Spark shipped Oct 15 as Muse Spark Open (its own entry).
Muse Spark 1.3 is out — same price as 1.2, and the radar called it in 61 seconds
2026-09-03 · Meta released Muse Spark 1.3 today. Its own words: "We're excited to release Muse Spark 1.3, which delivers improved performance across agentic and coding tasks." The numbers Meta gives are efficiency, not capability: ~20% fewer tool calls and ~25% fewer tokens than 1.2 on coding work, fewer interaction turns, less…
Muse Spark Open vs Muse Spark 1.3: quick answers
Which is better, Muse Spark Open or Muse Spark 1.3?
It depends on what you measure. Muse Spark 1.3 scores higher than Muse Spark Open on all 3 public leaderboards that rate both. Muse Spark 1.3's widest lead is on LMArena. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Muse Spark Open is at 16.7 and Muse Spark 1.3 at 58.9 (out of 100).
Which is newer, Muse Spark Open or Muse Spark 1.3?
Muse Spark Open. It went live on October 15, 2026, 43 days after Muse Spark 1.3 (September 2, 2026).
How do Muse Spark Open and Muse Spark 1.3 compare for coding?
On the ArtificialWatch coding index, Muse Spark Open is at 21.6 (#43 of 48) and Muse Spark 1.3 at 74.4 (#11). Muse Spark 1.3 scores higher on both coding boards that rate them.
Who makes Muse Spark Open and Muse Spark 1.3?
Both are from Meta.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed November 13, 2026). Boards measure different things, so raw scores are only comparable within a row.
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