Claude Fable 5 vs GPT-5.6 Luna
50 SHARED BENCHMARKSAcross 50 shared benchmarks, Claude Fable 5 scores higher on 48 and GPT-5.6 Luna on 2. The widest gap is AA-Omniscience · Non-hallucination, where Claude Fable 5 scores 36.4 against 7.4. GPT-5.6 Luna is the cheaper of the two on tracked API pricing ($0.20 against $10.00 per million input tokens).
At a glance
Release dates per Artificial Analysis. Prices: Artificial Analysis for Claude Fable 5; Artificial Analysis for GPT-5.6 Luna. ◆ = independently verified score.
Where each leadsby capability area · benchmark wins
Biggest gaps
Claude Fable 5 pulls furthest ahead on
- AA-Omniscience · Non-hallucination36.4 vs 7.4
- Terminal-Bench 4.042.4 vs 11.6
- SimpleBench81.9 vs 46.8
GPT-5.6 Luna pulls furthest ahead on
No ratified-area lead of 3 points or more.
Every shared benchmark50 · grouped by area
Reasoning 6
Coding 7
Agentic 6
Factuality 3
Instruction Following 1
Long Context 1
Math 3
Multimodal 2
Other shared benchmarks 21
Each score is the one the model's own page shows — the most authoritative tracked result for that benchmark, on the benchmark's standard methodology (source-attributed). ↓ marks lower-is-better metrics; ◆ an independently verified score. Open either model for its full surface, provenance and pricing. Quoted rates are the price-setter row we currently track for each model — its direct or vendor-official listing where one exists (direct, direct), otherwise the lowest tracked offer.