GLM-5.3 (Low) vs GPT-6 Luna (High)
Which is better for the money: GLM-5.3 (Low) by Z AI or GPT-6 Luna (High) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-26.
Trade-off
Verdict
Depends on your budget
GLM-5.3 (Low) scores 1.4 points higher (34.3 vs 32.9) but costs 21× as much to run the benchmark ($1013 vs $47.9; premium vs budget cost classes). They are not alternatives at one budget: pick GLM-5.3 (Low) when you need intelligence above 32.9, and GPT-6 Luna (High) when 32.9 is enough.
| Metric | GLM-5.3 (Low) | GPT-6 Luna (High) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 34.3 | 32.9 | −4.1% GPT-6 Luna (High) is 4.1% less intelligent |
| Total AA cost (lower is better) | $1,012.50 | $47.85 | −95.3% GPT-6 Luna (High) is 95.3% cheaper |
| End-to-end time (lower is better) | 30.92s | 16.20s | −47.6% GPT-6 Luna (High) is 47.6% faster |
| Price per 1M tokens (in / out) | $1.40 / $4.40 | $0.10 / $0.50 | |
| Input modalities | Text | Text, Image |
GPT-6 Luna (High) vs GLM-5.3 (Low): 4.1% less intelligence, 95.3% less cost to run the AA benchmark, and 47.6% faster end-to-end.
Today's Pareto frontier
Against the frontier
- GLM-5.3 (Low) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Xhigh) scores 51.00 for $662.
- GPT-6 Luna (High) is on today's frontier: nothing is both smarter and cheaper.
GLM-5.3 (Low)GPT-6 Luna (High)Today's Pareto frontierOpen-weights frontierEvery other model
Matchup
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