Astra/GPT-6 Leak and Agent Stack Implications

A leak analysis of OpenAI's Astra (GPT-6) reveals a 'mewfour' checkpoint that beats Claude Fable 5, with practical prep advice for agent stacks. The leak suggests a new pretrain is imminent, aligning with OpenAI's next model and agent ecosystem strategy. Prediction market odds for GPT-6 cratered earlier, but this leak reignites speculation.