GPT-5.5 (Xhigh) vs Grok 4.6 (Low)
Which is better for the money: GPT-5.5 (Xhigh) by OpenAI or Grok 4.6 (Low) by SpaceXAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-25.
Trade-off
Verdict
Depends on your budget
GPT-5.5 (Xhigh) scores 3.3 points higher (38.4 vs 35.1) but costs 8.6× as much to run the benchmark ($5294 vs $614; flagship vs premium cost classes). They are not alternatives at one budget: pick GPT-5.5 (Xhigh) when you need intelligence above 35.1, and Grok 4.6 (Low) when 35.1 is enough.
| Metric | GPT-5.5 (Xhigh) | Grok 4.6 (Low) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 38.4 | 35.1 | −8.6% Grok 4.6 (Low) is 8.6% less intelligent |
| Total AA cost (lower is better) | $5,294.36 | $613.92 | −88.4% Grok 4.6 (Low) is 88.4% cheaper |
| End-to-end time (lower is better) | 55.87s | 14.47s | −74.1% Grok 4.6 (Low) is 74.1% faster |
| Price per 1M tokens (in / out) | $5.00 / $30.0 | $2.00 / $6.00 | |
| Input modalities | Text, Image | Text, Image |
Grok 4.6 (Low) vs GPT-5.5 (Xhigh): 8.6% less intelligence, 88.4% less cost to run the AA benchmark, and 74.1% faster end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-5.5 (Xhigh) is off the frontier: at the same or lower cost, Claude Opus 5.5 (Xhigh, Default Fallback) scores 56.00 for $4057.
- Grok 4.6 (Low) is off the frontier: at the same or lower cost, GPT-6.1 Sol (High) scores 50.20 for $521.
GPT-5.5 (Xhigh)Grok 4.6 (Low)Today's Pareto frontierEvery other model
Matchup
Compare something else
Agents:
Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/gpt-5-5/grok-4-6-low · Markdown: /api/v1/compare/gpt-5-5/grok-4-6-low?format=md · llms.txt · agent skill