GPT-5.5 (High) vs Grok 4.3 (High)
Which is better for the money: GPT-5.5 (High) by OpenAI or Grok 4.3 (High) by SpaceXAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-24.
Trade-off
Verdict
Depends on your budget
GPT-5.5 (High) scores 12.1 points higher (37.0 vs 24.9) but costs 9.4× as much to run the benchmark ($3411 vs $363; flagship vs mid-range cost classes). They are not alternatives at one budget: pick GPT-5.5 (High) when you need intelligence above 24.9, and Grok 4.3 (High) when 24.9 is enough.
| Metric | GPT-5.5 (High) | Grok 4.3 (High) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 37.0 | 24.9 | −32.7% Grok 4.3 (High) is 32.7% less intelligent |
| Total AA cost (lower is better) | $3,410.76 | $363.24 | −89.4% Grok 4.3 (High) is 89.4% cheaper |
| End-to-end time (lower is better) | 19.79s | 24.88s | +25.7% Grok 4.3 (High) is 25.7% slower |
| Price per 1M tokens (in / out) | $5.00 / $30.0 | $1.25 / $2.50 | |
| Input modalities | Text, Image | Text, Image |
Grok 4.3 (High) vs GPT-5.5 (High): 32.7% less intelligence, 89.4% less cost to run the AA benchmark, and 25.7% slower end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-5.5 (High) is off the frontier: at the same or lower cost, Kimi K3.1 Pro scores 55.10 for $3117.
- Grok 4.3 (High) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Medium) scores 47.80 for $361.
GPT-5.5 (High)Grok 4.3 (High)Today's Pareto frontierEvery other model
Matchup
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Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/gpt-5-5-high/grok-4-3 · Markdown: /api/v1/compare/gpt-5-5-high/grok-4-3?format=md · llms.txt · agent skill