OpenAI has officially declared the elimination of text dialogue constraints for all ChatGPT users. Notably, free-tier users will now automatically enjoy the enhanced capabilities of the GPT-5.6 Luna model, accompanied by the introduction of a novel 'Think' feature. Meanwhile, subscribers to the Plus and Pro plans will gain exclusive access to the GPT-5.6 Sol model, renowned for delivering more succinct and precise replies. Presently, ChatGPT boasts a staggering user base, with over 1 billion weekly active participants.