GLM-5.1 (Reasoning) vs GPT-6 Astra (Xhigh)
Which is better for the money: GLM-5.1 (Reasoning) by Z AI or GPT-6 Astra (Xhigh) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-26.
Trade-off
Verdict
Depends on your budget
GPT-6 Astra (Xhigh) scores 26.3 points higher (52.4 vs 26.1) but costs 2.6× as much to run the benchmark ($3803 vs $1487; flagship vs premium cost classes). Pick GPT-6 Astra (Xhigh) when the extra intelligence is worth the premium, otherwise GLM-5.1 (Reasoning).
| Metric | GLM-5.1 (Reasoning) | GPT-6 Astra (Xhigh) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 26.1 | 52.4 | +100.8% GPT-6 Astra (Xhigh) is 2.0× more intelligent |
| Total AA cost (lower is better) | $1,486.78 | $3,802.98 | +155.8% GPT-6 Astra (Xhigh) is 2.6× more expensive |
| End-to-end time (lower is better) | 61.77s | 176.59s | +185.9% GPT-6 Astra (Xhigh) is 185.9% slower |
| Price per 1M tokens (in / out) | $1.28 / $4.07 | $10.0 / $50.0 | |
| Input modalities | Text | Text, Image |
GPT-6 Astra (Xhigh) vs GLM-5.1 (Reasoning): 100.8% more intelligence, 155.8% more cost to run the AA benchmark, and 185.9% slower 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.
- GPT-6 Astra (Xhigh) is off the frontier: at the same or lower cost, Kimi K3.1 Pro scores 55.10 for $3117.
GLM-5.1 (Reasoning)GPT-6 Astra (Xhigh)Today's Pareto frontierOpen-weights frontierEvery other model
Matchup
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