GLM-5.3-Flash vs GPT-5.5 (Xhigh)
Which is better for the money: GLM-5.3-Flash 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 2026-10-25.
Clear winner
Verdict
Pick GLM-5.3-Flash
GPT-5.5 (Xhigh) vs GLM-5.3-Flash: 8.1% less intelligence, 1632.9% more cost to run the AA benchmark, and 15.1% slower end-to-end.
| Metric | GLM-5.3-Flash | GPT-5.5 (Xhigh) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 41.8 | 38.4 | −8.1% GPT-5.5 (Xhigh) is 8.1% less intelligent |
| Total AA cost (lower is better) | $305.52 | $5,294.36 | +1632.9% GPT-5.5 (Xhigh) is 17× more expensive |
| End-to-end time (lower is better) | 38.89s | 44.76s | +15.1% GPT-5.5 (Xhigh) is 15.1% slower |
| Price per 1M tokens (in / out) | $0.15 / $0.50 | $5.00 / $30.0 | |
| Input modalities | Text, Image | Text, Image |
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-5.5 (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-FlashGPT-5.5 (Xhigh)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-5-5 · Markdown: /api/v1/compare/glm-5-3-flash/gpt-5-5?format=md · llms.txt · agent skill