Across 34 shared benchmarks, Claude Fable 5.1 scores higher on 33 and DeepSeek-V4-Flash on 1. The widest gap is OmniScience Non-Hallucination, where Claude Fable 5.1 scores 34.4 against 15.6. DeepSeek-V4-Flash is the cheaper of the two on tracked API pricing ($0.44 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 (anthropic-official, deepseek-official), otherwise the lowest tracked offer.