GPT-6 Luna vs Union Alpha (Stealth)
A direct, empirical evaluation of GPT-6 Luna (OpenAI) against Union Alpha (Stealth) (OpenRouter & OpenCode).
GPT-6 Luna
Developed by OpenAI · Proprietary High-Throughput Distillation parameters
High-throughput document extraction, sub-second routing, customer service triage, code autocomplete, and cost-optimized reasoning via Luna Pro mode.
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 | GPT-6 Luna | Union Alpha (Stealth) |
|---|---|---|
| SWE-bench Verified | 48.2% | 74.2% |
| MMLU-Pro | 74.6% | 89.8% |
| MATH-500 | 84.1% | 95.4% |
| Context Window | 1,050,000 tokens | 256,000 tokens |
| Input Pricing (per 1M) | $0.10 | $0.00 |
| Output Pricing (per 1M) | $0.50 | $0.00 |