OpenAI on August 6, 2026 moved its current model generation into ChatGPT’s free tier, announcing that GPT-5.6 Luna will become the default model for Free and Go users and that those users will get unlimited text chats. The announcement also ships an updated GPT-5.6 Sol for Plus and Pro subscribers, retuned for everyday conversation, across a service the company says 1 billion people use each week. For paid users, the updated Sol is built to give more direct responses, use tighter formatting…