GLM-5.1 (Reasoning) vs Kimi K3.1 Pro
Which is better for the money: GLM-5.1 (Reasoning) by Z AI or Kimi K3.1 Pro by Kimi? 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
Kimi K3.1 Pro scores 29.0 points higher (55.1 vs 26.1) but costs 2.1× as much to run the benchmark ($3117 vs $1487; flagship vs premium cost classes). Pick Kimi K3.1 Pro when the extra intelligence is worth the premium, otherwise GLM-5.1 (Reasoning).
| Metric | GLM-5.1 (Reasoning) | Kimi K3.1 Pro | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 26.1 | 55.1 | +111.1% Kimi K3.1 Pro is 2.1× more intelligent |
| Total AA cost (lower is better) | $1,486.78 | $3,117.31 | +109.7% Kimi K3.1 Pro is 2.1× more expensive |
| End-to-end time (lower is better) | 63.24s | 42.64s | −32.6% Kimi K3.1 Pro is 32.6% faster |
| Price per 1M tokens (in / out) | $1.28 / $4.07 | $2.00 / $10.0 | |
| Input modalities | Text | Text, Image |
Kimi K3.1 Pro vs GLM-5.1 (Reasoning): 111.1% more intelligence, 109.7% more cost to run the AA benchmark, and 32.6% faster end-to-end.
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.
- Kimi K3.1 Pro is on today's frontier: nothing is both smarter and cheaper.
GLM-5.1 (Reasoning)Kimi K3.1 ProToday'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-5-1/kimi-k3-1-pro · Markdown: /api/v1/compare/glm-5-1/kimi-k3-1-pro?format=md · llms.txt · agent skill