Aleph Alpha Kolibri vs Union Alpha (Stealth)
A direct, empirical evaluation of Aleph Alpha Kolibri (Aleph Alpha) against Union Alpha (Stealth) (OpenRouter & OpenCode).
Aleph Alpha Kolibri
Developed by Aleph Alpha · 78.2 Billion Total Parameters (32 routed experts + 2 shared experts) parameters
EU AI Act and GDPR compliant enterprise deployments, European legal and technical translation, 1M context long-document analysis, and 3.46B parameter active inference efficiency.
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 | Aleph Alpha Kolibri | Union Alpha (Stealth) |
|---|---|---|
| SWE-bench Verified | 62.8% | 74.2% |
| MMLU-Pro | 86.4% | 89.8% |
| MATH-500 | 92.4% | 95.4% |
| Context Window | 1,048,576 tokens (1M) | 256,000 tokens |
| Input Pricing (per 1M) | $0.18 | $0.00 |
| Output Pricing (per 1M) | $0.55 | $0.00 |