ChatGPT drops text limits for free users, GPT-5.6 Luna default

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OpenAI announced on Thursday that it is removing limits on text-based conversations for all ChatGPT users, on a product that recently passed 1 billion weekly users. Free and Go tiers move to a new default model, GPT-5.6 Luna, which replaces GPT-5.5, and both tiers gain a Think button that applies more reasoning power to complex questions.

The unlimited allowance covers text only. Separate limits remain in place for files, images, voice and image generation. According to the company’s announcement, the changes for Free and Go users roll out this week, and unlimited text chats together with the Think button arrive next week.

Paying customers get a parallel upgrade. Plus and Pro users receive a refreshed GPT-5.6 Sol tuned for quick tasks such as questions, web research, planning, writing and decision-making, available immediately. It ships with a thinking slider that lets users dial how much deliberation the model puts into an answer. The Sol variant used in Codex and Work is a separate version and stays unchanged.

OpenAI also shared internal evaluation numbers: compared with GPT-5.5-Instant, factual errors were 62% less common for GPT-5.6 Luna and 68% less common for the upgraded GPT-5.6 Sol.

For anyone who has been rationing free-tier messages, the practical takeaway is simple: text conversations stop counting, and the quality gap between the free default and the paid models narrows again - at least on paper, by OpenAI’s own measurements.

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