Claude Fable 5.1 (Xhigh, Default Fallback) vs GPT-5.5 (Xhigh)
Which is better for the money: Claude Fable 5.1 (Xhigh, Default Fallback) by Anthropic or GPT-5.5 (Xhigh) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-26.
Trade-off
Verdict
Depends on your budget
Claude Fable 5.1 (Xhigh, Default Fallba… scores 14.8 points higher (53.2 vs 38.4) but costs 1.7× as much to run the benchmark ($9063 vs $5294; both flagship class). Pick Claude Fable 5.1 (Xhigh, Default Fallba… when the extra intelligence is worth the premium, otherwise GPT-5.5 (Xhigh).
| Metric | Claude Fable 5.1 (Xhigh, Default Fallback) | GPT-5.5 (Xhigh) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 53.2 | 38.4 | −27.8% GPT-5.5 (Xhigh) is 27.8% less intelligent |
| Total AA cost (lower is better) | $9,063.11 | $5,294.36 | −41.6% GPT-5.5 (Xhigh) is 41.6% cheaper |
| End-to-end time (lower is better) | 108.69s | 82.06s | −24.5% GPT-5.5 (Xhigh) is 24.5% faster |
| Price per 1M tokens (in / out) | $10.0 / $50.0 | $5.00 / $30.0 | |
| Input modalities | Text, Image | Text, Image |
GPT-5.5 (Xhigh) vs Claude Fable 5.1 (Xhigh, Default Fallback): 27.8% less intelligence, 41.6% less cost to run the AA benchmark, and 24.5% 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 (Xhigh) is off the frontier: at the same or lower cost, Claude Opus 5.5 (Xhigh, Default Fallback) scores 56.00 for $4057.
Claude Fable 5.1 (Xhigh, Default Fallback)GPT-5.5 (Xhigh)Today's Pareto frontierEvery other model
Matchup
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