Gemini 4 Carbon vs Union Alpha (Stealth)
A direct, empirical evaluation of Gemini 4 Carbon (Google DeepMind) against Union Alpha (Stealth) (OpenRouter & OpenCode).
Gemini 4 Carbon
Developed by Google DeepMind · Carbon-Aware Frontier Transformer on TPU v6e parameters
Sub-watt green computing, 62% energy reduction per million tokens, carbon-aware datagrid routing, and eco-tier batch execution discounts.
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 | Gemini 4 Carbon | Union Alpha (Stealth) |
|---|---|---|
| SWE-bench Verified | 69.2% | 74.2% |
| MMLU-Pro | 84.6% | 89.8% |
| MATH-500 | 91.4% | 95.4% |
| Context Window | 1,000,000 tokens | 256,000 tokens |
| Input Pricing (per 1M) | $0.80 | $0.00 |
| Output Pricing (per 1M) | $2.40 | $0.00 |