Grok 4.5 (High) vs Nemotron 3 Ultra 550B A55B (Reasoning)
Which is better for the money: Grok 4.5 (High) by SpaceXAI 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.
Trade-off
Verdict
Depends on your budget
Grok 4.5 (High) scores 15.9 points higher (38.8 vs 22.9) but costs 1.9× as much to run the benchmark ($1120 vs $596; both premium class). Pick Grok 4.5 (High) when the extra intelligence is worth the premium, otherwise Nemotron 3 Ultra 550B A55B (Reasoning).
| Metric | Grok 4.5 (High) | Nemotron 3 Ultra 550B A55B (Reasoning) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 38.8 | 22.9 | −41.0% Nemotron 3 Ultra 550B… is 41.0% less intelligent |
| Total AA cost (lower is better) | $1,120.28 | $596.33 | −46.8% Nemotron 3 Ultra 550B… is 46.8% cheaper |
| End-to-end time (lower is better) | 17.69s | 15.29s | −13.6% Nemotron 3 Ultra 550B… is 13.6% faster |
| Price per 1M tokens (in / out) | $2.00 / $6.00 | $0.60 / $2.70 | |
| Input modalities | Text, Image | Text |
Nemotron 3 Ultra 550B A55B (Reasoning) vs Grok 4.5 (High): 41.0% less intelligence, 46.8% less cost to run the AA benchmark, and 13.6% faster end-to-end.
Today's Pareto frontier
Against the frontier
- Grok 4.5 (High) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
- 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.
Grok 4.5 (High)Nemotron 3 Ultra 550B A55B (Reasoning)Today's Pareto frontierOpen-weights frontierEvery other model
Matchup
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Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/grok-4-5/nvidia-nemotron-3-ultra-550b-a55b · Markdown: /api/v1/compare/grok-4-5/nvidia-nemotron-3-ultra-550b-a55b?format=md · llms.txt · agent skill