GLM-5.3-Flash vs GPT-6.1 Terra (Medium)
Which is better for the money: GLM-5.3-Flash by Z AI or GPT-6.1 Terra (Medium) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-27.
Trade-off
Verdict
Depends on your budget
GLM-5.3-Flash scores 0.5 points higher (41.8 vs 41.3) but costs 1.7× as much to run the benchmark ($306 vs $175; both mid-range class). Pick GLM-5.3-Flash when the extra intelligence is worth the premium, otherwise GPT-6.1 Terra (Medium).
| Metric | GLM-5.3-Flash | GPT-6.1 Terra (Medium) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 41.8 | 41.3 | −1.2% GPT-6.1 Terra (Medium) is 1.2% less intelligent |
| Total AA cost (lower is better) | $305.52 | $175.20 | −42.7% GPT-6.1 Terra (Medium) is 42.7% cheaper |
| End-to-end time (lower is better) | 35.84s | 6.95s | −80.6% GPT-6.1 Terra (Medium) is 80.6% faster |
| Price per 1M tokens (in / out) | $0.15 / $0.50 | $1.00 / $5.00 | |
| Input modalities | Text, Image | Text, Image |
GPT-6.1 Terra (Medium) vs GLM-5.3-Flash: 1.2% less intelligence, 42.7% less cost to run the AA benchmark, and 80.6% faster end-to-end.
Today's Pareto frontier
Against the frontier
- GLM-5.3-Flash is off the frontier: at the same or lower cost, MiMo-V2.6-Pro scores 46.30 for $207.
- GPT-6.1 Terra (Medium) is on today's frontier: nothing is both smarter and cheaper.
GLM-5.3-FlashGPT-6.1 Terra (Medium)Today's Pareto frontierOpen-weights frontierEvery other model
Matchup
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