GPT-5.5 (Medium) vs Grok 4.3 (High)
Which is better for the money: GPT-5.5 (Medium) by OpenAI or Grok 4.3 (High) by SpaceXAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-25.
Trade-off
Verdict
Depends on your budget
GPT-5.5 (Medium) scores 8.9 points higher (33.8 vs 24.9) but costs 5.8× as much to run the benchmark ($2095 vs $363; flagship vs mid-range cost classes). They are not alternatives at one budget: pick GPT-5.5 (Medium) when you need intelligence above 24.9, and Grok 4.3 (High) when 24.9 is enough.
| Metric | GPT-5.5 (Medium) | Grok 4.3 (High) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 33.8 | 24.9 | −26.3% Grok 4.3 (High) is 26.3% less intelligent |
| Total AA cost (lower is better) | $2,095.12 | $363.24 | −82.7% Grok 4.3 (High) is 82.7% cheaper |
| End-to-end time (lower is better) | 11.17s | 27.84s | +149.2% Grok 4.3 (High) is 149.2% 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 (Medium): 26.3% less intelligence, 82.7% less cost to run the AA benchmark, and 149.2% slower end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-5.5 (Medium) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
- 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 (Medium)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-medium/grok-4-3 · Markdown: /api/v1/compare/gpt-5-5-medium/grok-4-3?format=md · llms.txt · agent skill