GLM-5.1 (Reasoning) vs GLM-5.3-Flash
Which is better for the money: GLM-5.1 (Reasoning) by Z AI or GLM-5.3-Flash by Z AI? 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
GLM-5.3-Flash vs GLM-5.1 (Reasoning): 60.2% more intelligence, 79.5% less cost to run the AA benchmark, and 35.9% faster end-to-end.
| Metric | GLM-5.1 (Reasoning) | GLM-5.3-Flash | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 26.1 | 41.8 | +60.2% GLM-5.3-Flash is 60.2% more intelligent |
| Total AA cost (lower is better) | $1,486.78 | $305.52 | −79.5% GLM-5.3-Flash is 79.5% cheaper |
| End-to-end time (lower is better) | 60.66s | 38.89s | −35.9% GLM-5.3-Flash is 35.9% faster |
| Price per 1M tokens (in / out) | $1.28 / $4.07 | $0.15 / $0.50 | |
| Input modalities | Text | Text, Image |
Today's Pareto frontier
Against the frontier
- GLM-5.1 (Reasoning) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
- GLM-5.3-Flash is off the frontier: at the same or lower cost, MiMo-V2.6-Pro scores 46.30 for $207.
GLM-5.1 (Reasoning)GLM-5.3-FlashToday'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-5-1/glm-5-3-flash · Markdown: /api/v1/compare/glm-5-1/glm-5-3-flash?format=md · llms.txt · agent skill