GPT-6 Luna (Xhigh) vs Nemotron 3 Ultra 550B A55B (Reasoning)
Which is better for the money: GPT-6 Luna (Xhigh) by OpenAI or Nemotron 3 Ultra 550B A55B (Reasoning) by NVIDIA? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-28.
Clear winner
Verdict
Pick GPT-6 Luna (Xhigh)
Nemotron 3 Ultra 550B A55B (Reasoning) vs GPT-6 Luna (Xhigh): 49.4% less intelligence, 1698.4% more cost to run the AA benchmark, and 41.3% faster end-to-end.
| Metric | GPT-6 Luna (Xhigh) | Nemotron 3 Ultra 550B A55B (Reasoning) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 23.3 | 11.8 | −49.4% Nemotron 3 Ultra 550B… is 49.4% less intelligent |
| Total AA cost (lower is better) | $85.74 | $1,541.98 | +1698.4% Nemotron 3 Ultra 550B… is 18× more expensive |
| End-to-end time (lower is better) | 26.18s | 15.37s | −41.3% Nemotron 3 Ultra 550B… is 41.3% faster |
| Price per 1M tokens (in / out) | $0.10 / $0.50 | $0.60 / $2.70 | |
| Input modalities | Text, Image | Text |
Today's Pareto frontier
Against the frontier
- GPT-6 Luna (Xhigh) is off the frontier: at the same or lower cost, Claude Haiku 5.5 (Medium) scores 24.60 for $72.7.
- Nemotron 3 Ultra 550B A55B (Reasoning) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 54.50 for $1124.
GPT-6 Luna (Xhigh)Nemotron 3 Ultra 550B A55B (Reasoning)Today's Pareto frontierOpen-weights frontierEvery other model
Matchup
Compare something else
Agents:
Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/gpt-6-luna-xhigh/nvidia-nemotron-3-ultra-550b-a55b · Markdown: /api/v1/compare/gpt-6-luna-xhigh/nvidia-nemotron-3-ultra-550b-a55b?format=md · llms.txt · agent skill