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Muse Spark Open vs GLM-5.3
GLM-5.3 scores higher than Muse Spark Open on all 4 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 GLM-5.3 at 46.7 (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 | GLM-5.3 | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,526.3 | 1,622.5 | GLM-5.3 |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 48.6 | 59.8 | GLM-5.3 |
| Artificial Analysis intelligence index · measured runs only | 24.9 | 31.7 | GLM-5.3 |
| Epoch AI Epoch Capabilities Index (ECI) · many benchmarks on one scale | 155.4 | 157.1 | GLM-5.3 |
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 GLM-5.3 at 50.4 (#20). GLM-5.3 scores higher on the one coding board that rates both.
| Coding board | Muse Spark Open | GLM-5.3 |
|---|---|---|
| Vals Vibe Code Bench | 76.2 | 78.1 |
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.
GLM-5.3 at a glance
- Developer
- Zhipu AI
- Status
- Live since August 14, 2026
- API price
- $1.40 input / $4.40 output per 1M tokens · Z.AI, glm-5.3
- Context window
- 1M tokens
Live - same 743B base as 5.2, every gain from post-training · tops CyberGym · open weights on Hugging Face (zai-org/GLM-5.3, 141 safetensors files, public when we read it Sep 25; repo created Aug 25) · Anthropic research (Sep 29): builds end-to-end exploits near Claude Mythos Preview's rate (ExploitBench 50 of 410 vs 56 of 410), and its safeguards fell to simple bypasses 64-100% of the time · Epoch AI report (Oct 29): built one-click file-reading exploits for all six Firefox releases Sep 17-Oct 26 from published-but-unshipped fixes, about $1,000 each, with no refusals at any provider.
Epoch AI: open-weight GLM 5.3 built working Firefox exploits from security fixes that had not shipped yet, for about $1,000 each
2026-10-30 · An open-weight model can now turn browser security fixes that are public but not yet shipped into working exploits on its own, according to a report Epoch AI published October 29.
Anthropic: open-weights GLM-5.3 nearly matches Claude Mythos Preview at building exploits, and its safeguards are easy to strip
2026-09-29 · Anthropic published research on September 29 testing Z.ai's GLM-5.3, an open-weights model anyone can download, on offensive cyber tasks. Its finding: GLM-5.3 can build working end-to-end exploits at close to the rate of Claude Mythos Preview, the model Anthropic released only to vetted defenders.
Muse Spark Open vs GLM-5.3: quick answers
Which is better, Muse Spark Open or GLM-5.3?
It depends on what you measure. GLM-5.3 scores higher than Muse Spark Open on all 4 public leaderboards that rate both. GLM-5.3's widest lead is on Vals AI. 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 GLM-5.3 at 46.7 (out of 100).
Which is newer, Muse Spark Open or GLM-5.3?
Muse Spark Open. It went live on October 15, 2026, 62 days after GLM-5.3 (August 14, 2026).
How do Muse Spark Open and GLM-5.3 compare for coding?
On the ArtificialWatch coding index, Muse Spark Open is at 21.6 (#43 of 48) and GLM-5.3 at 50.4 (#20). GLM-5.3 scores higher on the one coding board that rates both.
Who makes Muse Spark Open and GLM-5.3?
Muse Spark Open is from Meta; GLM-5.3 is from Zhipu AI.
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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