Claude Fable 5.2 (Max, Default Fallback) vs GPT-5.6 Luna (Max)
Which is better for the money: Claude Fable 5.2 (Max, Default Fallback) by Anthropic or GPT-5.6 Luna (Max) 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 (Max, Default Fallback) scores 40.8 points higher (64.6 vs 23.8) but costs 66× as much to run the benchmark ($22191 vs $334; flagship vs mid-range cost classes). They are not alternatives at one budget: pick Claude Fable 5.2 (Max, Default Fallback) when you need intelligence above 23.8, and GPT-5.6 Luna (Max) when 23.8 is enough.
| Metric | Claude Fable 5.2 (Max, Default Fallback) | GPT-5.6 Luna (Max) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 64.6 | 23.8 | −63.2% GPT-5.6 Luna (Max) is 63.2% less intelligent |
| Total AA cost (lower is better) | $22,191.42 | $334.35 | −98.5% GPT-5.6 Luna (Max) is 98.5% cheaper |
| End-to-end time (lower is better) | 258.66s | 132.39s | −48.8% GPT-5.6 Luna (Max) is 48.8% faster |
| Price per 1M tokens (in / out) | $8.00 / $40.0 | $0.20 / $1.20 | |
| Input modalities | Text, Image | Text, Image |
GPT-5.6 Luna (Max) vs Claude Fable 5.2 (Max, Default Fallback): 63.2% less intelligence, 98.5% less cost to run the AA benchmark, and 48.8% faster end-to-end.
Today's Pareto frontier
Against the frontier
- Claude Fable 5.2 (Max, Default Fallback) is on today's frontier: nothing is both smarter and cheaper.
- GPT-5.6 Luna (Max) is off the frontier: at the same or lower cost, GPT-6.1 Terra (High) scores 42.40 for $267.
Claude Fable 5.2 (Max, Default Fallback)GPT-5.6 Luna (Max)Today's Pareto frontierEvery other model
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