GLM-5.2 vs Muse Spark Open
| Spec | GLM-5.2 | Muse Spark Open |
|---|---|---|
| Respan Index | 42.1 (#54) | 42.8 (#53) |
| Blended price per 1M | $0.354 | $2 |
| Context window | 1M | 1.0M |
| Input / output per 1M | $0.006 / $1.4 | $1.25 / $4.25 |
| Max output | 131K | - |
| Input | text | text, vision, video, audio |
| Released | 2026-06-24 | 2026-10-15 |
Respan Index by category
Each category is scored 0 to 100, and how far ahead the winner is. Leads under a point are close to even.
| Category | GLM-5.2 | Muse Spark Open |
|---|---|---|
| Coding | 22.8 GLM-5.2 | 21.7 Muse Spark Open |
| Agents | 56.4 GLM-5.2 | 44.5 Muse Spark Open |
| Reasoning | 41.9 GLM-5.2 | 50.1 Muse Spark Open |
| Knowledge & language | 34.5 GLM-5.2 | 56.6 Muse Spark Open |
| Human preference | 56.1 GLM-5.2 | 54.0 Muse Spark Open |
Benchmarks both report
Muse Spark Open leads on 5 of the 8 benchmarks both report. Higher is better. Each score links to where it was published.
| Benchmark | GLM-5.2 | Muse Spark Open |
|---|---|---|
| LMArena WebDev (LMArena) | 1606 | 1526 |
| APEX-Agents (Mercor) | 45.2% | 33.4% |
| FrontierMath Tier 4 v2 (Epoch AI) | 29.3% | 31.7% |
| FrontierMath Tiers 1-3 v2 (Epoch AI) | 59.2% | 69.8% |
| GPQA Diamond | 91.9% | 89% |
| OTIS Mock AIME 2024-2025 (Epoch AI) | 86.4% | 98.1% |
| SimpleQA Verified | 34.2% | 56.6% |
| Toolathlon Verified | 59.9% | 72.8% |
FAQ
Is GLM-5.2 better than Muse Spark Open?
Muse Spark Open scores 42.8 on the Respan Index (#53), ahead of GLM-5.2 at 42.1 (#54). Muse Spark Open leads on 5 of the 8 benchmarks both report.
Which is cheaper, GLM-5.2 or Muse Spark Open?
GLM-5.2 lists at $0.006 input and $1.4 output per 1M tokens; Muse Spark Open at $1.25 and $4.25. GLM-5.2 is 5.6x cheaper per token at list price.
Which has the larger context window?
GLM-5.2 accepts 1M tokens and Muse Spark Open 1.0M tokens.