GLM-5.1 (Reasoning) vs GPT-5.6 Luna (Xhigh)
Which is better for the money: GLM-5.1 (Reasoning) by Z AI or GPT-5.6 Luna (Xhigh) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-26.
Clear winner
Verdict
Pick GPT-5.6 Luna (Xhigh)
GPT-5.6 Luna (Xhigh) vs GLM-5.1 (Reasoning): 32.6% more intelligence, 87.9% less cost to run the AA benchmark, and 31.7% faster end-to-end.
| Metric | GLM-5.1 (Reasoning) | GPT-5.6 Luna (Xhigh) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 26.1 | 34.6 | +32.6% GPT-5.6 Luna (Xhigh) is 32.6% more intelligent |
| Total AA cost (lower is better) | $1,486.78 | $179.33 | −87.9% GPT-5.6 Luna (Xhigh) is 87.9% cheaper |
| End-to-end time (lower is better) | 59.15s | 40.39s | −31.7% GPT-5.6 Luna (Xhigh) is 31.7% faster |
| Price per 1M tokens (in / out) | $1.28 / $4.07 | $0.20 / $1.20 | |
| Input modalities | Text | Text, Image |
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.
- GPT-5.6 Luna (Xhigh) is off the frontier: at the same or lower cost, Claude Haiku 5.5 (Xhigh) scores 41.20 for $158.
GLM-5.1 (Reasoning)GPT-5.6 Luna (Xhigh)Today's Pareto frontierOpen-weights frontierEvery other model
Matchup
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Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/glm-5-1/gpt-5-6-luna-xhigh · Markdown: /api/v1/compare/glm-5-1/gpt-5-6-luna-xhigh?format=md · llms.txt · agent skill