Gemini 3.1 Pro Preview vs GLM-5.1 (Reasoning)
Which is better for the money: Gemini 3.1 Pro Preview by Google or GLM-5.1 (Reasoning) by Z AI? 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
Gemini 3.1 Pro Preview scores 3.6 points higher (29.7 vs 26.1) but costs 1.3× as much to run the benchmark ($1935 vs $1487; both premium class). Pick Gemini 3.1 Pro Preview when the extra intelligence is worth the premium, otherwise GLM-5.1 (Reasoning).
| Metric | Gemini 3.1 Pro Preview | GLM-5.1 (Reasoning) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 29.7 | 26.1 | −12.1% GLM-5.1 (Reasoning) is 12.1% less intelligent |
| Total AA cost (lower is better) | $1,935.39 | $1,486.78 | −23.2% GLM-5.1 (Reasoning) is 23.2% cheaper |
| End-to-end time (lower is better) | 24.90s | 63.24s | +154.0% GLM-5.1 (Reasoning) is 154.0% slower |
| Price per 1M tokens (in / out) | $2.00 / $12.0 | $1.28 / $4.07 | |
| Input modalities | Text, Image, Speech, Video | Text |
GLM-5.1 (Reasoning) vs Gemini 3.1 Pro Preview: 12.1% less intelligence, 23.2% less cost to run the AA benchmark, and 154.0% slower end-to-end.
Today's Pareto frontier
Against the frontier
- Gemini 3.1 Pro Preview is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
- GLM-5.1 (Reasoning) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
Gemini 3.1 Pro PreviewGLM-5.1 (Reasoning)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/gemini-3-1-pro-preview/glm-5-1 · Markdown: /api/v1/compare/gemini-3-1-pro-preview/glm-5-1?format=md · llms.txt · agent skill