GLM-5.3 (Low) vs GPT-5.5 (High)
Which is better for the money: GLM-5.3 (Low) by Z AI or GPT-5.5 (High) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-25.
Trade-off
Verdict
Depends on your budget
GPT-5.5 (High) scores 2.7 points higher (37.0 vs 34.3) but costs 3.4× as much to run the benchmark ($3411 vs $1013; flagship vs premium cost classes). They are not alternatives at one budget: pick GPT-5.5 (High) when you need intelligence above 34.3, and GLM-5.3 (Low) when 34.3 is enough.
| Metric | GLM-5.3 (Low) | GPT-5.5 (High) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 34.3 | 37.0 | +7.9% GPT-5.5 (High) is 7.9% more intelligent |
| Total AA cost (lower is better) | $1,012.50 | $3,410.76 | +236.9% GPT-5.5 (High) is 3.4× more expensive |
| End-to-end time (lower is better) | 31.07s | 19.56s | −37.0% GPT-5.5 (High) is 37.0% faster |
| Price per 1M tokens (in / out) | $1.40 / $4.40 | $5.00 / $30.0 | |
| Input modalities | Text | Text, Image |
GPT-5.5 (High) vs GLM-5.3 (Low): 7.9% more intelligence, 236.9% more cost to run the AA benchmark, and 37.0% 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-5.5 (High) is off the frontier: at the same or lower cost, Kimi K3.1 Pro scores 55.10 for $3117.
GLM-5.3 (Low)GPT-5.5 (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-low/gpt-5-5-high · Markdown: /api/v1/compare/glm-5-3-low/gpt-5-5-high?format=md · llms.txt · agent skill