Claude Fable 5 (Max, Opus 4.8 Fallback) vs GPT-5.4 nano (Xhigh)
Which is better for the money: Claude Fable 5 (Max, Opus 4.8 Fallback) by Anthropic or GPT-5.4 nano (Xhigh) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-24.
Trade-off
Verdict
Depends on your budget
Claude Fable 5 (Max, Opus 4.8 Fallback) scores 28.9 points higher (49.6 vs 20.7) but costs 34× as much to run the benchmark ($11161 vs $331; 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 20.7, and GPT-5.4 nano (Xhigh) when 20.7 is enough.
| Metric | Claude Fable 5 (Max, Opus 4.8 Fallback) | GPT-5.4 nano (Xhigh) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 49.6 | 20.7 | −58.3% GPT-5.4 nano (Xhigh) is 58.3% less intelligent |
| Total AA cost (lower is better) | $11,160.86 | $331.24 | −97.0% GPT-5.4 nano (Xhigh) is 97.0% cheaper |
| End-to-end time (lower is better) | 71.92s | 53.29s | −25.9% GPT-5.4 nano (Xhigh) is 25.9% faster |
| Price per 1M tokens (in / out) | $10.0 / $50.0 | $0.20 / $1.25 | |
| Input modalities | Text, Image | Text, Image |
GPT-5.4 nano (Xhigh) vs Claude Fable 5 (Max, Opus 4.8 Fallback): 58.3% less intelligence, 97.0% less cost to run the AA benchmark, and 25.9% 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.
- GPT-5.4 nano (Xhigh) 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)GPT-5.4 nano (Xhigh)Today's Pareto frontierEvery other model
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