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Pythagoras-Prover is a compute-efficient family of Lean theorem provers that achieves strong performance using curriculum supervised fine-tuning and a novel Augmented Lean Formalisation technique. The 4B model surpasses DeepSeek-Prover-V2-671B at pass@32 on MiniF2F-Test, and the 32B model sets a new state-of-the-art among open-source provers.