Nano Banana 3 Pro vs Union Alpha (Stealth)
A direct, empirical evaluation of Nano Banana 3 Pro (Google DeepMind) against Union Alpha (Stealth) (OpenRouter & OpenCode).
Nano Banana 3 Pro
Developed by Google DeepMind · 2.8 Billion Parameters parameters
Zero-latency mobile on-device reasoning, 82ms TTFT, offline audio-visual tool execution, and local Android system integration.
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 | Nano Banana 3 Pro | Union Alpha (Stealth) |
|---|---|---|
| SWE-bench Verified | 58.6% | 74.2% |
| MMLU-Pro | 74.2% | 89.8% |
| MATH-500 | 82.5% | 95.4% |
| Context Window | 131,072 tokens | 256,000 tokens |
| Input Pricing (per 1M) | $0.00 | $0.00 |
| Output Pricing (per 1M) | $0.00 | $0.00 |