Claude Fable 5.1 (Xhigh, Default Fallback) vs GPT-5.5 (High)
Which is better for the money: Claude Fable 5.1 (Xhigh, Default Fallback) by Anthropic or GPT-5.5 (High) 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
Claude Fable 5.1 (Xhigh, Default Fallba… scores 16.2 points higher (53.2 vs 37.0) but costs 2.8× as much to run the benchmark ($9063 vs $3181; both flagship class). Pick Claude Fable 5.1 (Xhigh, Default Fallba… when the extra intelligence is worth the premium, otherwise GPT-5.5 (High).
| Metric | Claude Fable 5.1 (Xhigh, Default Fallback) | GPT-5.5 (High) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 53.2 | 37.0 | −30.5% GPT-5.5 (High) is 30.5% less intelligent |
| Total AA cost (lower is better) | $9,063.11 | $3,181.05 | −64.9% GPT-5.5 (High) is 64.9% cheaper |
| End-to-end time (lower is better) | 104.03s | 35.54s | −65.8% GPT-5.5 (High) is 65.8% faster |
| Price per 1M tokens (in / out) | $10.0 / $50.0 | $5.00 / $30.0 | |
| Input modalities | Text, Image | Text, Image |
GPT-5.5 (High) vs Claude Fable 5.1 (Xhigh, Default Fallback): 30.5% less intelligence, 64.9% less cost to run the AA benchmark, and 65.8% faster end-to-end.
Today's Pareto frontier
Against the frontier
- Claude Fable 5.1 (Xhigh, Default Fallback) is off the frontier: at the same or lower cost, Claude Opus 5.5 (Max, Default Fallback) scores 57.60 for $8708.
- GPT-5.5 (High) is off the frontier: at the same or lower cost, Kimi K3.1 Pro scores 55.10 for $3117.
Claude Fable 5.1 (Xhigh, Default Fallback)GPT-5.5 (High)Today's Pareto frontierEvery other model
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