Mistral Magistral + Hugging Face open-r1: the 'open reasoning' stack — closed frontier no longer has a monopoly on chain-of-thought

Combining Mistral Magistral (open-weight reasoning model with chain-of-thought template and Le Chat reasoning UI integration) and Hugging Face open-r1 (fully open reproduction of a frontier-class reasoning model with full open weights, training data, and training code) gives creators an open-weight reasoning stack. The two releases take different bets on 'openness': Magistral ships weights with a permissive license; open-r1 ships weights + training data + training code. Together they show that the closed frontier no longer has a monopoly on chain-of-thought reasoning.