GLM-5.1 (Reasoning) vs GPT-6 Luna (Max)
Which is better for the money: GLM-5.1 (Reasoning) by Z AI or GPT-6 Luna (Max) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-25.
Clear winner
Verdict
Pick GPT-6 Luna (Max)
GPT-6 Luna (Max) vs GLM-5.1 (Reasoning): 46.0% more intelligence, 91.8% less cost to run the AA benchmark, and 34.2% slower end-to-end.
| Metric | GLM-5.1 (Reasoning) | GPT-6 Luna (Max) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 26.1 | 38.1 | +46.0% GPT-6 Luna (Max) is 46.0% more intelligent |
| Total AA cost (lower is better) | $1,486.78 | $122.05 | −91.8% GPT-6 Luna (Max) is 91.8% cheaper |
| End-to-end time (lower is better) | 62.92s | 84.41s | +34.2% GPT-6 Luna (Max) is 34.2% slower |
| 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 (Max) is on today's frontier: nothing is both smarter and cheaper.
GLM-5.1 (Reasoning)GPT-6 Luna (Max)Today's Pareto frontierOpen-weights frontierEvery other model
Matchup
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