Claude Fable 5 (Max, Opus 4.8 Fallback) vs GLM-5.3-Flash
Which is better for the money: Claude Fable 5 (Max, Opus 4.8 Fallback) by Anthropic or GLM-5.3-Flash 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
Claude Fable 5 (Max, Opus 4.8 Fallback) scores 7.8 points higher (49.6 vs 41.8) but costs 37× as much to run the benchmark ($11161 vs $306; flagship vs mid-range cost classes). They are not alternatives at one budget: pick Claude Fable 5 (Max, Opus 4.8 Fallback) when you need intelligence above 41.8, and GLM-5.3-Flash when 41.8 is enough.
| Metric | Claude Fable 5 (Max, Opus 4.8 Fallback) | GLM-5.3-Flash | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 49.6 | 41.8 | −15.7% GLM-5.3-Flash is 15.7% less intelligent |
| Total AA cost (lower is better) | $11,160.86 | $305.52 | −97.3% GLM-5.3-Flash is 97.3% cheaper |
| End-to-end time (lower is better) | 85.37s | 38.89s | −54.4% GLM-5.3-Flash is 54.4% faster |
| Price per 1M tokens (in / out) | $10.0 / $50.0 | $0.15 / $0.50 | |
| Input modalities | Text, Image | Text, Image |
GLM-5.3-Flash vs Claude Fable 5 (Max, Opus 4.8 Fallback): 15.7% less intelligence, 97.3% less cost to run the AA benchmark, and 54.4% faster end-to-end.
Today's Pareto frontier
Against the frontier
- Claude Fable 5 (Max, Opus 4.8 Fallback) is off the frontier: at the same or lower cost, Claude Opus 5.5 (Max, Default Fallback) scores 57.60 for $8708.
- GLM-5.3-Flash is off the frontier: at the same or lower cost, MiMo-V2.6-Pro scores 46.30 for $207.
Claude Fable 5 (Max, Opus 4.8 Fallback)GLM-5.3-FlashToday's Pareto frontierOpen-weights frontierEvery other model
Matchup
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