Last Week in AI #346 - 719 math manuscripts, 2 Western open models, 1 more safety resignation

OpenAI has released 719 mathematical proofs generated by an unreleased frontier model to demonstrate its reasoning capabilities. Simultaneously, Mistral and Reflection AI have introduced new open-weight models, providing alternatives to proprietary systems and growing competition against Chinese developers. These developments highlight the ongoing industry focus on improving model transparency and maintaining the competitiveness of open-access artificial intelligence tools.