GLM-5.1 (Reasoning) vs GPT-6 Astra (Low)
Which is better for the money: GLM-5.1 (Reasoning) by Z AI or GPT-6 Astra (Low) 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 (Low) scores 19.7 points higher (45.8 vs 26.1) but costs 1.0× as much to run the benchmark ($1537 vs $1487; both premium class). Pick GPT-6 Astra (Low) when the extra intelligence is worth the premium, otherwise GLM-5.1 (Reasoning).
| Metric | GLM-5.1 (Reasoning) | GPT-6 Astra (Low) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 26.1 | 45.8 | +75.5% GPT-6 Astra (Low) is 75.5% more intelligent |
| Total AA cost (lower is better) | $1,486.78 | $1,536.78 | +3.4% GPT-6 Astra (Low) is 3.4% more expensive |
| End-to-end time (lower is better) | 61.77s | 12.01s | −80.6% GPT-6 Astra (Low) is 80.6% faster |
| Price per 1M tokens (in / out) | $1.28 / $4.07 | $10.0 / $50.0 | |
| Input modalities | Text | Text, Image |
GPT-6 Astra (Low) vs GLM-5.1 (Reasoning): 75.5% more intelligence, 3.4% more cost to run the AA benchmark, and 80.6% 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.
- GPT-6 Astra (Low) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
GLM-5.1 (Reasoning)GPT-6 Astra (Low)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-5-1/gpt-6-astra-low · Markdown: /api/v1/compare/glm-5-1/gpt-6-astra-low?format=md · llms.txt · agent skill