DeepSeek V4 Flash 0420 (High) vs GLM-5.1 (Reasoning)
Which is better for the money: DeepSeek V4 Flash 0420 (High) by DeepSeek or GLM-5.1 (Reasoning) by Z AI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-25.
Trade-off
Verdict
Depends on your budget
GLM-5.1 (Reasoning) scores 1.7 points higher (26.1 vs 24.4) but costs 12× as much to run the benchmark ($1487 vs $121; premium vs mid-range cost classes). They are not alternatives at one budget: pick GLM-5.1 (Reasoning) when you need intelligence above 24.4, and DeepSeek V4 Flash 0420 (High) when 24.4 is enough.
| Metric | DeepSeek V4 Flash 0420 (High) | GLM-5.1 (Reasoning) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 24.4 | 26.1 | +7.0% GLM-5.1 (Reasoning) is 7.0% more intelligent |
| Total AA cost (lower is better) | $121.20 | $1,486.78 | +1126.7% GLM-5.1 (Reasoning) is 12× more expensive |
| End-to-end time (lower is better) | Not reported | 64.38s | — not comparable |
| Price per 1M tokens (in / out) | $0.11 / $0.23 | $1.28 / $4.07 | |
| Input modalities | Text | Text |
GLM-5.1 (Reasoning) vs DeepSeek V4 Flash 0420 (High): 7.0% more intelligence, 1126.7% more cost to run the AA benchmark, and end-to-end time not fully reported.
Today's Pareto frontier
Against the frontier
- DeepSeek V4 Flash 0420 (High) is off the frontier: at the same or lower cost, MiMo-V2.6-Flash scores 37.90 for $110.
- GLM-5.1 (Reasoning) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
DeepSeek V4 Flash 0420 (High)GLM-5.1 (Reasoning)Today's Pareto frontierOpen-weights frontierEvery other model
Matchup
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