GLM-5-3 (Flagship) vs Union Alpha (Stealth)
A direct, empirical evaluation of GLM-5-3 (Flagship) (Zhipu AI & THUDM) against Union Alpha (Stealth) (OpenRouter & OpenCode).
GLM-5-3 (Flagship)
Developed by Zhipu AI & THUDM · 744B parameters
Complex algorithmic reasoning, multi-step code synthesis, and long-horizon tool execution.
Union Alpha (Stealth)
Developed by OpenRouter & OpenCode · Multi-Model Ensemble Mixture parameters
Terminal coding agents, pull-request synthesis, multi-model consensus verification, and zero-cost autonomous refactoring.
| Metric | GLM-5-3 (Flagship) | Union Alpha (Stealth) |
|---|---|---|
| SWE-bench Verified | 54.8% | 74.2% |
| MMLU-Pro | 78.4% | 89.8% |
| MATH-500 | 93.6% | 95.4% |
| Context Window | 256,000 tokens | 256,000 tokens |
| Input Pricing (per 1M) | $0.55 | $0.00 |
| Output Pricing (per 1M) | $2.19 | $0.00 |