GPT-5.6 Terra (Xhigh) vs Grok 4.5 (High)
Which is better for the money: GPT-5.6 Terra (Xhigh) by OpenAI or Grok 4.5 (High) by SpaceXAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-26.
Trade-off
Verdict
Depends on your budget
Grok 4.5 (High) scores 0.8 points higher (38.8 vs 38.0) but costs 1.0× as much to run the benchmark ($1244 vs $1187; both premium class). Pick Grok 4.5 (High) when the extra intelligence is worth the premium, otherwise GPT-5.6 Terra (Xhigh).
| Metric | GPT-5.6 Terra (Xhigh) | Grok 4.5 (High) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 38.0 | 38.8 | +2.1% Grok 4.5 (High) is 2.1% more intelligent |
| Total AA cost (lower is better) | $1,186.77 | $1,243.85 | +4.8% Grok 4.5 (High) is 4.8% more expensive |
| End-to-end time (lower is better) | 33.69s | 19.69s | −41.6% Grok 4.5 (High) is 41.6% faster |
| Price per 1M tokens (in / out) | $2.00 / $12.0 | $2.00 / $6.00 | |
| Input modalities | Text, Image | Text, Image |
Grok 4.5 (High) vs GPT-5.6 Terra (Xhigh): 2.1% more intelligence, 4.8% more cost to run the AA benchmark, and 41.6% faster end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-5.6 Terra (Xhigh) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
- Grok 4.5 (High) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
GPT-5.6 Terra (Xhigh)Grok 4.5 (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-5-6-terra-xhigh/grok-4-5 · Markdown: /api/v1/compare/gpt-5-6-terra-xhigh/grok-4-5?format=md · llms.txt · agent skill