MiniMax M3.1-Flash-Preview vs Union Alpha (Stealth)
A direct, empirical evaluation of MiniMax M3.1-Flash-Preview (MiniMax) against Union Alpha (Stealth) (OpenRouter & OpenCode).
MiniMax M3.1-Flash-Preview
Developed by MiniMax · Proprietary Sparse Coding MoE parameters
Low-latency interactive IDE code completions at 165 tokens/sec, SWE-bench Verified bug fixes (73.8%), terminal automation, and budget-optimized pull request reviews.
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 | MiniMax M3.1-Flash-Preview | Union Alpha (Stealth) |
|---|---|---|
| SWE-bench Verified | 73.8% | 74.2% |
| MMLU-Pro | 81.2% | 89.8% |
| MATH-500 | 92.4% | 95.4% |
| Context Window | 1,000,000 tokens | 256,000 tokens |
| Input Pricing (per 1M) | $0.10 | $0.00 |
| Output Pricing (per 1M) | $0.40 | $0.00 |