GLM-5.3 (Low) vs GPT-6 Luna (Medium)
Which is better for the money: GLM-5.3 (Low) 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.
Trade-off
Verdict
Depends on your budget
GLM-5.3 (Low) scores 4.4 points higher (34.3 vs 29.9) but costs 32× as much to run the benchmark ($1013 vs $31.2; premium vs budget cost classes). They are not alternatives at one budget: pick GLM-5.3 (Low) when you need intelligence above 29.9, and GPT-6 Luna (Medium) when 29.9 is enough.
| Metric | GLM-5.3 (Low) | GPT-6 Luna (Medium) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 34.3 | 29.9 | −12.8% GPT-6 Luna (Medium) is 12.8% less intelligent |
| Total AA cost (lower is better) | $1,012.50 | $31.17 | −96.9% GPT-6 Luna (Medium) is 96.9% cheaper |
| End-to-end time (lower is better) | 31.21s | 8.25s | −73.6% GPT-6 Luna (Medium) is 73.6% faster |
| Price per 1M tokens (in / out) | $1.40 / $4.40 | $0.10 / $0.50 | |
| Input modalities | Text | Text, Image |
GPT-6 Luna (Medium) vs GLM-5.3 (Low): 12.8% less intelligence, 96.9% less cost to run the AA benchmark, and 73.6% 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 (Medium) is on today's frontier: nothing is both smarter and cheaper.
GLM-5.3 (Low)GPT-6 Luna (Medium)Today's Pareto frontierOpen-weights frontierEvery other model
Matchup
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