GLM-5.3-Flash vs GPT-6 Luna (High)
Which is better for the money: GLM-5.3-Flash 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-Flash scores 8.9 points higher (41.8 vs 32.9) but costs 6.4× as much to run the benchmark ($306 vs $47.9; mid-range vs budget cost classes). They are not alternatives at one budget: pick GLM-5.3-Flash when you need intelligence above 32.9, and GPT-6 Luna (High) when 32.9 is enough.
| Metric | GLM-5.3-Flash | GPT-6 Luna (High) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 41.8 | 32.9 | −21.3% GPT-6 Luna (High) is 21.3% less intelligent |
| Total AA cost (lower is better) | $305.52 | $47.85 | −84.3% GPT-6 Luna (High) is 84.3% cheaper |
| End-to-end time (lower is better) | 37.79s | 14.65s | −61.2% GPT-6 Luna (High) is 61.2% faster |
| Price per 1M tokens (in / out) | $0.15 / $0.50 | $0.10 / $0.50 | |
| Input modalities | Text, Image | Text, Image |
GPT-6 Luna (High) vs GLM-5.3-Flash: 21.3% less intelligence, 84.3% less cost to run the AA benchmark, and 61.2% faster end-to-end.
Today's Pareto frontier
Against the frontier
- GLM-5.3-Flash is off the frontier: at the same or lower cost, MiMo-V2.6-Pro scores 46.30 for $207.
- GPT-6 Luna (High) is on today's frontier: nothing is both smarter and cheaper.
GLM-5.3-FlashGPT-6 Luna (High)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-5-3-flash/gpt-6-luna-high · Markdown: /api/v1/compare/glm-5-3-flash/gpt-6-luna-high?format=md · llms.txt · agent skill