GLM-5.3-Flash vs GPT-5.6 Luna (High)
Which is better for the money: GLM-5.3-Flash by Z AI or GPT-5.6 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 9.7 points higher (41.8 vs 32.1) but costs 2.8× as much to run the benchmark ($306 vs $108; both mid-range class). Pick GLM-5.3-Flash when the extra intelligence is worth the premium, otherwise GPT-5.6 Luna (High).
| Metric | GLM-5.3-Flash | GPT-5.6 Luna (High) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 41.8 | 32.1 | −23.2% GPT-5.6 Luna (High) is 23.2% less intelligent |
| Total AA cost (lower is better) | $305.52 | $108.15 | −64.6% GPT-5.6 Luna (High) is 64.6% cheaper |
| End-to-end time (lower is better) | 37.69s | 13.41s | −64.4% GPT-5.6 Luna (High) is 64.4% 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 (High) vs GLM-5.3-Flash: 23.2% less intelligence, 64.6% less cost to run the AA benchmark, and 64.4% 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 (High) is off the frontier: at the same or lower cost, Claude Haiku 5.5 (High) scores 37.80 for $94.1.
GLM-5.3-FlashGPT-5.6 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-5-6-luna-high · Markdown: /api/v1/compare/glm-5-3-flash/gpt-5-6-luna-high?format=md · llms.txt · agent skill