LeChaton Fat Claims 85.8% on DeepSWE, Outpacing Claude and GPT-5.5

A forthcoming European model called LeChaton Fat is claiming 2.4x Claude Fable 5 performance and 5x the efficiency of GPT-5.5, though independent benchmarks are still pending.

LeChaton Fat, a model from a European lab, is generating pre-release buzz with aggressive benchmark claims: 2.4x Claude Fable 5 performance, 5x more efficient than GPT-5.5, and an 85.8% score on DeepSWE, according to @DevBySami. If those numbers survive independent evaluation, it would represent a significant shift in the competitive landscape — particularly the efficiency claim, which matters more for production deployment than raw performance.

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