GLM-5.1 (Reasoning) vs Grok 4.3 (High)

Which is better for the money: GLM-5.1 (Reasoning) by Z AI 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

Z AIGLM-5.1 (Reasoning)Off the frontier

Intelligence: 26.10
Total cost: $1487

SpaceXAIGrok 4.3 (High)Off the frontier

Intelligence: 24.90
Total cost: $363

Verdict

Depends on your budget

GLM-5.1 (Reasoning) scores 1.2 points higher (26.1 vs 24.9) but costs 4.1× as much to run the benchmark ($1487 vs $363; premium vs mid-range cost classes). They are not alternatives at one budget: pick GLM-5.1 (Reasoning) when you need intelligence above 24.9, and Grok 4.3 (High) when 24.9 is enough.

Metric	GLM-5.1 (Reasoning)	Grok 4.3 (High)	Difference
Intelligence (higher is better)	26.1	24.9	−4.6% Grok 4.3 (High) is 4.6% less intelligent
Total AA cost (lower is better)	$1,486.78	$363.24	−75.6% Grok 4.3 (High) is 75.6% cheaper
End-to-end time (lower is better)	60.76s	24.88s	−59.1% Grok 4.3 (High) is 59.1% faster
Price per 1M tokens (in / out)	$1.28 / $4.07	$1.25 / $2.50
Input modalities	Text	Text, Image

Grok 4.3 (High) vs GLM-5.1 (Reasoning): 4.6% less intelligence, 75.6% less cost to run the AA benchmark, and 59.1% faster end-to-end.

Open this matchup in the interactive picker GLM-5.1 (Reasoning): what beats it Grok 4.3 (High): what beats it

Today's Pareto frontier

Against the frontier

GLM-5.1 (Reasoning) 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.

GLM-5.1 (Reasoning)Grok 4.3 (High)Today's Pareto frontierOpen-weights frontierEvery other model

Matchup

Compare something else

Agents: Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/glm-5-1/grok-4-3 · Markdown: /api/v1/compare/glm-5-1/grok-4-3?format=md · llms.txt · agent skill