GPT-6 Luna (Non-reasoning) vs Nemotron 3 Ultra 550B A55B (Reasoning)
Which is better for the money: GPT-6 Luna (Non-reasoning) 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 2026-10-27.
Depends on your budget
Nemotron 3 Ultra 550B A55B (Reasoning) scores 4.4 points higher (22.9 vs 18.5) but costs 31× as much to run the benchmark ($596 vs $19.2; premium vs budget cost classes). They are not alternatives at one budget: pick Nemotron 3 Ultra 550B A55B (Reasoning) when you need intelligence above 18.5, and GPT-6 Luna (Non-reasoning) when 18.5 is enough.
| Metric | GPT-6 Luna (Non-reasoning) | Nemotron 3 Ultra 550B A55B (Reasoning) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 18.5 | 22.9 | +23.8% Nemotron 3 Ultra 550B… is 23.8% more intelligent |
| Total AA cost (lower is better) | $19.16 | $596.33 | +3012.4% Nemotron 3 Ultra 550B… is 31× more expensive |
| End-to-end time (lower is better) | 5.07s | 14.75s | +190.9% Nemotron 3 Ultra 550B… is 190.9% slower |
| Price per 1M tokens (in / out) | $0.10 / $0.50 | $0.60 / $2.70 | |
| Input modalities | Text, Image | Text |
Nemotron 3 Ultra 550B A55B (Reasoning) vs GPT-6 Luna (Non-reasoning): 23.8% more intelligence, 3012.4% more cost to run the AA benchmark, and 190.9% slower end-to-end.
Against the frontier
- GPT-6 Luna (Non-reasoning) is off the frontier: at the same or lower cost, GPT-6 Luna (Low) scores 21.50 for $10.6.
- Nemotron 3 Ultra 550B A55B (Reasoning) is off the frontier: at the same or lower cost, GPT-6.1 Sol (High) scores 50.20 for $521.
Compare something else
Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/gpt-6-luna-non-reasoning/nvidia-nemotron-3-ultra-550b-a55b · Markdown: /api/v1/compare/gpt-6-luna-non-reasoning/nvidia-nemotron-3-ultra-550b-a55b?format=md · llms.txt · agent skill