GPT-5.6 Luna (Non-reasoning) vs Nemotron 3 Ultra 550B A55B (Reasoning)
Which is better for the money: GPT-5.6 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 7.4 points higher (22.9 vs 15.5) but costs 26× as much to run the benchmark ($596 vs $23.0; premium vs budget cost classes). They are not alternatives at one budget: pick Nemotron 3 Ultra 550B A55B (Reasoning) when you need intelligence above 15.5, and GPT-5.6 Luna (Non-reasoning) when 15.5 is enough.
| Metric | GPT-5.6 Luna (Non-reasoning) | Nemotron 3 Ultra 550B A55B (Reasoning) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 15.5 | 22.9 | +47.7% Nemotron 3 Ultra 550B… is 47.7% more intelligent |
| Total AA cost (lower is better) | $22.97 | $596.33 | +2496.1% Nemotron 3 Ultra 550B… is 26× more expensive |
| End-to-end time (lower is better) | 5.19s | 15.23s | +193.4% Nemotron 3 Ultra 550B… is 193.4% slower |
| Price per 1M tokens (in / out) | $0.20 / $1.20 | $0.60 / $2.70 | |
| Input modalities | Text, Image | Text |
Nemotron 3 Ultra 550B A55B (Reasoning) vs GPT-5.6 Luna (Non-reasoning): 47.7% more intelligence, 2496.1% more cost to run the AA benchmark, and 193.4% slower end-to-end.
Against the frontier
- GPT-5.6 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-5-6-luna-non-reasoning/nvidia-nemotron-3-ultra-550b-a55b · Markdown: /api/v1/compare/gpt-5-6-luna-non-reasoning/nvidia-nemotron-3-ultra-550b-a55b?format=md · llms.txt · agent skill