Claude Fable 5 (Max, Opus 4.8 Fallback) vs GLM-5.3 (Max)
Which is better for the money: Claude Fable 5 (Max, Opus 4.8 Fallback) by Anthropic or GLM-5.3 (Max) 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 4.8 points higher (49.6 vs 44.8) but costs 4.5× as much to run the benchmark ($11161 vs $2503; both flagship class). They are not alternatives at one budget: pick Claude Fable 5 (Max, Opus 4.8 Fallback) when you need intelligence above 44.8, and GLM-5.3 (Max) when 44.8 is enough.
| Metric | Claude Fable 5 (Max, Opus 4.8 Fallback) | GLM-5.3 (Max) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 49.6 | 44.8 | −9.7% GLM-5.3 (Max) is 9.7% less intelligent |
| Total AA cost (lower is better) | $11,160.86 | $2,503.48 | −77.6% GLM-5.3 (Max) is 77.6% cheaper |
| End-to-end time (lower is better) | 77.70s | 31.62s | −59.3% GLM-5.3 (Max) is 59.3% faster |
| Price per 1M tokens (in / out) | $10.0 / $50.0 | $1.40 / $4.40 | |
| Input modalities | Text, Image | Text |
GLM-5.3 (Max) vs Claude Fable 5 (Max, Opus 4.8 Fallback): 9.7% less intelligence, 77.6% less cost to run the AA benchmark, and 59.3% 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 (Max) is off the frontier: at the same or lower cost, Claude Opus 5.5 (High, Default Fallback) scores 53.60 for $2172.
Claude Fable 5 (Max, Opus 4.8 Fallback)GLM-5.3 (Max)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/claude-fable-5/glm-5-3 · Markdown: /api/v1/compare/claude-fable-5/glm-5-3?format=md · llms.txt · agent skill