GLM-5.1 (Reasoning) vs GPT-6 Astra (High)
Which is better for the money: GLM-5.1 (Reasoning) by Z AI or GPT-6 Astra (High) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-25.
Trade-off
Verdict
Depends on your budget
GPT-6 Astra (High) scores 24.8 points higher (50.9 vs 26.1) but costs 2.0× as much to run the benchmark ($2925 vs $1487; flagship vs premium cost classes). Pick GPT-6 Astra (High) when the extra intelligence is worth the premium, otherwise GLM-5.1 (Reasoning).
| Metric | GLM-5.1 (Reasoning) | GPT-6 Astra (High) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 26.1 | 50.9 | +95.0% GPT-6 Astra (High) is 95.0% more intelligent |
| Total AA cost (lower is better) | $1,486.78 | $2,925.01 | +96.7% GPT-6 Astra (High) is 96.7% more expensive |
| End-to-end time (lower is better) | 62.92s | 49.71s | −21.0% GPT-6 Astra (High) is 21.0% faster |
| Price per 1M tokens (in / out) | $1.28 / $4.07 | $10.0 / $50.0 | |
| Input modalities | Text | Text, Image |
GPT-6 Astra (High) vs GLM-5.1 (Reasoning): 95.0% more intelligence, 96.7% more cost to run the AA benchmark, and 21.0% 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 (High) is off the frontier: at the same or lower cost, Claude Opus 5.5 (High, Default Fallback) scores 53.60 for $2172.
GLM-5.1 (Reasoning)GPT-6 Astra (High)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-high · Markdown: /api/v1/compare/glm-5-1/gpt-6-astra-high?format=md · llms.txt · agent skill