GLM-5.3 (Low) vs GPT-5.5 (Xhigh)
Which is better for the money: GLM-5.3 (Low) by Z AI or GPT-5.5 (Xhigh) 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
GPT-5.5 (Xhigh) scores 4.1 points higher (38.4 vs 34.3) but costs 5.2× as much to run the benchmark ($5294 vs $1013; flagship vs premium cost classes). They are not alternatives at one budget: pick GPT-5.5 (Xhigh) 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 (Xhigh) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 34.3 | 38.4 | +12.0% GPT-5.5 (Xhigh) is 12.0% more intelligent |
| Total AA cost (lower is better) | $1,012.50 | $5,294.36 | +422.9% GPT-5.5 (Xhigh) is 5.2× more expensive |
| End-to-end time (lower is better) | 31.21s | 44.96s | +44.1% GPT-5.5 (Xhigh) is 44.1% slower |
| Price per 1M tokens (in / out) | $1.40 / $4.40 | $5.00 / $30.0 | |
| Input modalities | Text | Text, Image |
GPT-5.5 (Xhigh) vs GLM-5.3 (Low): 12.0% more intelligence, 422.9% more cost to run the AA benchmark, and 44.1% slower 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 (Xhigh) is off the frontier: at the same or lower cost, Claude Opus 5.5 (Xhigh, Default Fallback) scores 56.00 for $4057.
GLM-5.3 (Low)GPT-5.5 (Xhigh)Today's Pareto frontierOpen-weights frontierEvery other model
Matchup
Compare something else
Agents:
Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/glm-5-3-low/gpt-5-5 · Markdown: /api/v1/compare/glm-5-3-low/gpt-5-5?format=md · llms.txt · agent skill