GPT-5.6 Terra (Xhigh) vs Grok 4.6 (Low)
Which is better for the money: GPT-5.6 Terra (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 2026-10-27.
Trade-off
Verdict
Depends on your budget
GPT-5.6 Terra (Xhigh) scores 2.9 points higher (38.0 vs 35.1) but costs 1.9× as much to run the benchmark ($1187 vs $614; both premium class). Pick GPT-5.6 Terra (Xhigh) when the extra intelligence is worth the premium, otherwise Grok 4.6 (Low).
| Metric | GPT-5.6 Terra (Xhigh) | Grok 4.6 (Low) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 38.0 | 35.1 | −7.6% Grok 4.6 (Low) is 7.6% less intelligent |
| Total AA cost (lower is better) | $1,186.77 | $613.92 | −48.3% Grok 4.6 (Low) is 48.3% cheaper |
| End-to-end time (lower is better) | 33.63s | 13.17s | −60.8% Grok 4.6 (Low) is 60.8% faster |
| Price per 1M tokens (in / out) | $2.00 / $12.0 | $2.00 / $6.00 | |
| Input modalities | Text, Image | Text, Image |
Grok 4.6 (Low) vs GPT-5.6 Terra (Xhigh): 7.6% less intelligence, 48.3% less cost to run the AA benchmark, and 60.8% 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 4.6 (Low) is off the frontier: at the same or lower cost, GPT-6.1 Sol (High) scores 50.20 for $521.
GPT-5.6 Terra (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-5-6-terra-xhigh/grok-4-6-low · Markdown: /api/v1/compare/gpt-5-6-terra-xhigh/grok-4-6-low?format=md · llms.txt · agent skill