GPT-5.6 Terra (High) vs Grok 4.6 (Xhigh)
Which is better for the money: GPT-5.6 Terra (High) by OpenAI or Grok 4.6 (Xhigh) 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
Grok 4.6 (Xhigh) scores 10.0 points higher (44.2 vs 34.2) but costs 2.9× as much to run the benchmark ($2242 vs $768; flagship vs premium cost classes). Pick Grok 4.6 (Xhigh) when the extra intelligence is worth the premium, otherwise GPT-5.6 Terra (High).
| Metric | GPT-5.6 Terra (High) | Grok 4.6 (Xhigh) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 34.2 | 44.2 | +29.2% Grok 4.6 (Xhigh) is 29.2% more intelligent |
| Total AA cost (lower is better) | $767.78 | $2,241.91 | +192.0% Grok 4.6 (Xhigh) is 2.9× more expensive |
| End-to-end time (lower is better) | 6.58s | 43.76s | +565.0% Grok 4.6 (Xhigh) is 565.0% slower |
| Price per 1M tokens (in / out) | $2.00 / $12.0 | $2.00 / $6.00 | |
| Input modalities | Text, Image | Text, Image |
Grok 4.6 (Xhigh) vs GPT-5.6 Terra (High): 29.2% more intelligence, 192.0% more cost to run the AA benchmark, and 565.0% slower end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-5.6 Terra (High) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Xhigh) scores 51.00 for $662.
- Grok 4.6 (Xhigh) is off the frontier: at the same or lower cost, Claude Opus 5.5 (High, Default Fallback) scores 53.60 for $2172.
GPT-5.6 Terra (High)Grok 4.6 (Xhigh)Today's Pareto frontierEvery other model
Matchup
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