GLM-5.1 (Reasoning) vs GPT-6 Luna (Medium)
Which is better for the money: GLM-5.1 (Reasoning) by Z AI or GPT-6 Luna (Medium) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-24.
Clear winner
Verdict
Pick GPT-6 Luna (Medium)
GPT-6 Luna (Medium) vs GLM-5.1 (Reasoning): 14.6% more intelligence, 97.9% less cost to run the AA benchmark, and 87.0% faster end-to-end.
| Metric | GLM-5.1 (Reasoning) | GPT-6 Luna (Medium) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 26.1 | 29.9 | +14.6% GPT-6 Luna (Medium) is 14.6% more intelligent |
| Total AA cost (lower is better) | $1,486.78 | $31.17 | −97.9% GPT-6 Luna (Medium) is 97.9% cheaper |
| End-to-end time (lower is better) | 63.24s | 8.25s | −87.0% GPT-6 Luna (Medium) is 87.0% faster |
| Price per 1M tokens (in / out) | $1.28 / $4.07 | $0.10 / $0.50 | |
| 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-6 Luna (Medium) is on today's frontier: nothing is both smarter and cheaper.
GLM-5.1 (Reasoning)GPT-6 Luna (Medium)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-6-luna-medium · Markdown: /api/v1/compare/glm-5-1/gpt-6-luna-medium?format=md · llms.txt · agent skill