GPT-5.6 Terra (Xhigh) vs Grok 4.3 (High)

Which is better for the money: GPT-5.6 Terra (Xhigh) by OpenAI or Grok 4.3 (High) by SpaceXAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-26.

Trade-off

OpenAIGPT-5.6 Terra (Xhigh)Off the frontier

Intelligence: 38.00
Total cost: $1187

SpaceXAIGrok 4.3 (High)Off the frontier

Intelligence: 24.90
Total cost: $363

Verdict

Depends on your budget

GPT-5.6 Terra (Xhigh) scores 13.1 points higher (38.0 vs 24.9) but costs 3.3× as much to run the benchmark ($1187 vs $363; premium vs mid-range cost classes). They are not alternatives at one budget: pick GPT-5.6 Terra (Xhigh) when you need intelligence above 24.9, and Grok 4.3 (High) when 24.9 is enough.

Metric	GPT-5.6 Terra (Xhigh)	Grok 4.3 (High)	Difference
Intelligence (higher is better)	38.0	24.9	−34.5% Grok 4.3 (High) is 34.5% less intelligent
Total AA cost (lower is better)	$1,186.77	$363.24	−69.4% Grok 4.3 (High) is 69.4% cheaper
End-to-end time (lower is better)	33.69s	31.39s	−6.8% Grok 4.3 (High) is 6.8% faster
Price per 1M tokens (in / out)	$2.00 / $12.0	$1.25 / $2.50
Input modalities	Text, Image	Text, Image

Grok 4.3 (High) vs GPT-5.6 Terra (Xhigh): 34.5% less intelligence, 69.4% less cost to run the AA benchmark, and 6.8% faster end-to-end.

Open this matchup in the interactive picker GPT-5.6 Terra (Xhigh): what beats it Grok 4.3 (High): what beats it

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 4.3 (High) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Medium) scores 47.80 for $361.

GPT-5.6 Terra (Xhigh)Grok 4.3 (High)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-4-3 · Markdown: /api/v1/compare/gpt-5-6-terra-xhigh/grok-4-3?format=md · llms.txt · agent skill