OpenAI Removes ChatGPT Free Text Limits and Introduces GPT-5.6 Luna
OpenAI has removed text conversation limits for free and Go ChatGPT users, while upgrading the default free model to GPT-5.6 Luna. Additionally, a new "Think" button allows free users to trigger deeper reasoning, and paid users receive the GPT-5.6 Sol model with a customizable "thinking intensity" slider. This update significantly lowers the barrier to entry for advanced AI reasoning, helping OpenAI retain free users and counter competition from rivals like Google Gemini and Anthropic Claude. By offering unlimited text chat and optional reasoning compute, OpenAI makes its ecosystem more accessible and engaging. While text conversations are now unlimited, usage caps still apply to image generation, file uploads, voice mode, and reasoning queries that involve files or images. The GPT-5.6 generation categorizes its models into different capability tiers, with Luna optimized for high-volume, low-latency tasks and Sol serving as the flagship model for paid tiers.
## BACKGROUND
Large language models traditionally generate responses instantly based on pre-trained patterns, but newer architectures utilize inference-time compute to let models "think" longer before answering. OpenAI's GPT-5.6 family uses distinct tier names, where Luna represents a cost-efficient, high-throughput model, and Sol represents a more advanced reasoning model.