DeepSeek-V3 vs Union Alpha (Stealth)
A direct, empirical evaluation of DeepSeek-V3 (DeepSeek-AI) against Union Alpha (Stealth) (OpenRouter & OpenCode).
DeepSeek-V3
Developed by DeepSeek-AI · 671B parameters
Cost-effective high-throughput general reasoning and bilingual generation.
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 | DeepSeek-V3 | Union Alpha (Stealth) |
|---|---|---|
| SWE-bench Verified | 49.2% | 74.2% |
| MMLU-Pro | 75.9% | 89.8% |
| MATH-500 | 90.2% | 95.4% |
| Context Window | 128,000 tokens | 256,000 tokens |
| Input Pricing (per 1M) | $0.14 | $0.00 |
| Output Pricing (per 1M) | $0.28 | $0.00 |