Claude Fable 5.2 (Low, Default Fallback) vs GPT-6 Luna (Xhigh)
Which is better for the money: Claude Fable 5.2 (Low, Default Fallback) by Anthropic or GPT-6 Luna (Xhigh) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-11-10.
Trade-off
Verdict
Depends on your budget
Claude Fable 5.2 (Low, Default Fallback) scores 30.4 points higher (53.9 vs 23.5) but costs 33× as much to run the benchmark ($2862 vs $85.7; flagship vs mid-range cost classes). They are not alternatives at one budget: pick Claude Fable 5.2 (Low, Default Fallback) when you need intelligence above 23.5, and GPT-6 Luna (Xhigh) when 23.5 is enough.
| Metric | Claude Fable 5.2 (Low, Default Fallback) | GPT-6 Luna (Xhigh) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 53.9 | 23.5 | −56.4% GPT-6 Luna (Xhigh) is 56.4% less intelligent |
| Total AA cost (lower is better) | $2,861.78 | $85.74 | −97.0% GPT-6 Luna (Xhigh) is 97.0% cheaper |
| End-to-end time (lower is better) | 21.73s | 43.39s | +99.7% GPT-6 Luna (Xhigh) is 99.7% slower |
| Price per 1M tokens (in / out) | $8.00 / $40.0 | $0.10 / $0.50 | |
| Input modalities | Text, Image | Text, Image |
GPT-6 Luna (Xhigh) vs Claude Fable 5.2 (Low, Default Fallback): 56.4% less intelligence, 97.0% less cost to run the AA benchmark, and 99.7% slower end-to-end.
Today's Pareto frontier
Against the frontier
- Claude Fable 5.2 (Low, Default Fallback) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 54.60 for $1124.
- GPT-6 Luna (Xhigh) is off the frontier: at the same or lower cost, Claude Haiku 5.5 (Medium) scores 24.60 for $72.7.
Claude Fable 5.2 (Low, Default Fallback)GPT-6 Luna (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-5-2-low/gpt-6-luna-xhigh · Markdown: /api/v1/compare/claude-fable-5-2-low/gpt-6-luna-xhigh?format=md · llms.txt · agent skill