Claude Fable 5.1 (Medium, Default Fallback) vs GPT-5.5 (Medium)
Which is better for the money: Claude Fable 5.1 (Medium, Default Fallback) by Anthropic or GPT-5.5 (Medium) by OpenAI? 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 5.1 (Medium, Default Fallb… scores 15.1 points higher (48.9 vs 33.8) but costs 1.9× as much to run the benchmark ($3983 vs $2095; both flagship class). Pick Claude Fable 5.1 (Medium, Default Fallb… when the extra intelligence is worth the premium, otherwise GPT-5.5 (Medium).
| Metric | Claude Fable 5.1 (Medium, Default Fallback) | GPT-5.5 (Medium) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 48.9 | 33.8 | −30.9% GPT-5.5 (Medium) is 30.9% less intelligent |
| Total AA cost (lower is better) | $3,983.28 | $2,095.12 | −47.4% GPT-5.5 (Medium) is 47.4% cheaper |
| End-to-end time (lower is better) | 16.18s | 11.50s | −28.9% GPT-5.5 (Medium) is 28.9% faster |
| Price per 1M tokens (in / out) | $10.0 / $50.0 | $5.00 / $30.0 | |
| Input modalities | Text, Image | Text, Image |
GPT-5.5 (Medium) vs Claude Fable 5.1 (Medium, Default Fallback): 30.9% less intelligence, 47.4% less cost to run the AA benchmark, and 28.9% faster end-to-end.
Today's Pareto frontier
Against the frontier
- Claude Fable 5.1 (Medium, Default Fallback) is off the frontier: at the same or lower cost, Kimi K3.1 Pro scores 55.10 for $3117.
- GPT-5.5 (Medium) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
Claude Fable 5.1 (Medium, Default Fallback)GPT-5.5 (Medium)Today's Pareto frontierEvery other model
Matchup
Compare something else
Agents:
Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/claude-fable-5-1-medium/gpt-5-5-medium · Markdown: /api/v1/compare/claude-fable-5-1-medium/gpt-5-5-medium?format=md · llms.txt · agent skill