GLM-5.3-Flash vs GPT-5.6 Luna (Low)
Which is better for the money: GLM-5.3-Flash by Z AI or GPT-5.6 Luna (Low) 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 20.8 points higher (41.8 vs 21.0) but costs 11× as much to run the benchmark ($306 vs $27.0; mid-range vs budget cost classes). They are not alternatives at one budget: pick GLM-5.3-Flash when you need intelligence above 21.0, and GPT-5.6 Luna (Low) when 21.0 is enough.
| Metric | GLM-5.3-Flash | GPT-5.6 Luna (Low) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 41.8 | 21.0 | −49.8% GPT-5.6 Luna (Low) is 49.8% less intelligent |
| Total AA cost (lower is better) | $305.52 | $27.02 | −91.2% GPT-5.6 Luna (Low) is 91.2% cheaper |
| End-to-end time (lower is better) | 37.69s | 5.84s | −84.5% GPT-5.6 Luna (Low) is 84.5% faster |
| Price per 1M tokens (in / out) | $0.15 / $0.50 | $0.20 / $1.20 | |
| Input modalities | Text, Image | Text, Image |
GPT-5.6 Luna (Low) vs GLM-5.3-Flash: 49.8% less intelligence, 91.2% less cost to run the AA benchmark, and 84.5% 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-5.6 Luna (Low) is off the frontier: at the same or lower cost, GPT-6 Luna (Low) scores 21.50 for $10.6.
GLM-5.3-FlashGPT-5.6 Luna (Low)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-5-6-luna-low · Markdown: /api/v1/compare/glm-5-3-flash/gpt-5-6-luna-low?format=md · llms.txt · agent skill