Across 27 shared benchmarks, Claude Fable 5 scores higher on 21 and GLM 5.3 Flash on 6. The widest gap is AA-Omniscience, where Claude Fable 5 scores 43.3 against 7.5. GLM 5.3 Flash is the cheaper of the two on tracked API pricing ($0.15 against $10.00 per million input tokens).
Best tracked score per model per benchmark (default configuration; source-attributed). ↓ marks lower-is-better metrics. 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.