Claude Fable 5.2 (Medium, Default Fallback) vs GPT-6 Luna (Low)
Which is better for the money: Claude Fable 5.2 (Medium, Default Fallback) by Anthropic or GPT-6 Luna (Low) 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 (Medium, Default Fallb… scores 46.7 points higher (56.4 vs 9.7) but costs 370× as much to run the benchmark ($3360 vs $9.09; flagship vs budget cost classes). They are not alternatives at one budget: pick Claude Fable 5.2 (Medium, Default Fallb… when you need intelligence above 9.7, and GPT-6 Luna (Low) when 9.7 is enough.
| Metric | Claude Fable 5.2 (Medium, Default Fallback) | GPT-6 Luna (Low) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 56.4 | 9.7 | −82.8% GPT-6 Luna (Low) is 82.8% less intelligent |
| Total AA cost (lower is better) | $3,359.66 | $9.09 | −99.7% GPT-6 Luna (Low) is 99.7% cheaper |
| End-to-end time (lower is better) | 27.53s | 7.21s | −73.8% GPT-6 Luna (Low) is 73.8% faster |
| Price per 1M tokens (in / out) | $8.00 / $40.0 | $0.10 / $0.50 | |
| Input modalities | Text, Image | Text, Image |
GPT-6 Luna (Low) vs Claude Fable 5.2 (Medium, Default Fallback): 82.8% less intelligence, 99.7% less cost to run the AA benchmark, and 73.8% faster end-to-end.
Today's Pareto frontier
Against the frontier
- Claude Fable 5.2 (Medium, Default Fallback) is on today's frontier: nothing is both smarter and cheaper.
- GPT-6 Luna (Low) is on today's frontier: nothing is both smarter and cheaper.
Claude Fable 5.2 (Medium, Default Fallback)GPT-6 Luna (Low)Today's Pareto frontierEvery other model
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