Grok 4.3 (High) vs Nemotron 3 Ultra 550B A55B (Reasoning)
Which is better for the money: Grok 4.3 (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 2026-10-26.
Clear winner
Verdict
Pick Grok 4.3 (High)
Nemotron 3 Ultra 550B A55B (Reasoning) vs Grok 4.3 (High): 8.0% less intelligence, 64.2% more cost to run the AA benchmark, and 53.2% faster end-to-end.
| Metric | Grok 4.3 (High) | Nemotron 3 Ultra 550B A55B (Reasoning) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 24.9 | 22.9 | −8.0% Nemotron 3 Ultra 550B… is 8.0% less intelligent |
| Total AA cost (lower is better) | $363.24 | $596.33 | +64.2% Nemotron 3 Ultra 550B… is 64.2% more expensive |
| End-to-end time (lower is better) | 32.60s | 15.27s | −53.2% Nemotron 3 Ultra 550B… is 53.2% faster |
| Price per 1M tokens (in / out) | $1.25 / $2.50 | $0.60 / $2.70 | |
| Input modalities | Text, Image | Text |
Today's Pareto frontier
Against the frontier
- Grok 4.3 (High) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Medium) scores 47.80 for $361.
- 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 4.3 (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-4-3/nvidia-nemotron-3-ultra-550b-a55b · Markdown: /api/v1/compare/grok-4-3/nvidia-nemotron-3-ultra-550b-a55b?format=md · llms.txt · agent skill