OpenAI has declared that it is doing away with message caps for ChatGPT users on the free and Go plans. The company also shared that its platform has hit a milestone of one billion weekly active users. Additionally, a new "Think" feature is being introduced, allowing users to enable enhanced reasoning capabilities for difficult queries. OpenAI further noted that the GPT-5.6 Luna model will now serve as the default, taking the place of GPT-5.5.