Claude Fable 5.1 (Max, Default Fallback) vs GPT-6 Astra (Xhigh)
Which is better for the money: Claude Fable 5.1 (Max, Default Fallback) by Anthropic or GPT-6 Astra (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 (Max, Default Fallback) scores 1.0 points higher (53.4 vs 52.4) but costs 3.5× as much to run the benchmark ($13129 vs $3803; both flagship class). They are not alternatives at one budget: pick Claude Fable 5.1 (Max, Default Fallback) when you need intelligence above 52.4, and GPT-6 Astra (Xhigh) when 52.4 is enough.
| Metric | Claude Fable 5.1 (Max, Default Fallback) | GPT-6 Astra (Xhigh) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 53.4 | 52.4 | −1.9% GPT-6 Astra (Xhigh) is 1.9% less intelligent |
| Total AA cost (lower is better) | $13,128.86 | $3,802.98 | −71.0% GPT-6 Astra (Xhigh) is 71.0% cheaper |
| End-to-end time (lower is better) | 251.24s | 188.57s | −24.9% GPT-6 Astra (Xhigh) is 24.9% faster |
| Price per 1M tokens (in / out) | $10.0 / $50.0 | $10.0 / $50.0 | |
| Input modalities | Text, Image | Text, Image |
GPT-6 Astra (Xhigh) vs Claude Fable 5.1 (Max, Default Fallback): 1.9% less intelligence, 71.0% less cost to run the AA benchmark, and 24.9% faster end-to-end.
Today's Pareto frontier
Against the frontier
- Claude Fable 5.1 (Max, 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-6 Astra (Xhigh) is off the frontier: at the same or lower cost, Kimi K3.1 Pro scores 55.10 for $3117.
Claude Fable 5.1 (Max, Default Fallback)GPT-6 Astra (Xhigh)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/gpt-6-astra-xhigh · Markdown: /api/v1/compare/claude-fable-5-1/gpt-6-astra-xhigh?format=md · llms.txt · agent skill