Agents & Products

Improving GPT‑5.6 Sol in ChatGPT, and expanding access to GPT-5.6 Luna for free users

ChatGPT introduces improved GPT-5.6 Sol with better accuracy and consistency, plus expanded access for free users and unlimited everyday chats with GPT-5.6 Luna.

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OpenAI announced updates to two AI models used in ChatGPT: GPT-5.6 Sol for paid users and GPT-5.6 Luna for free users. For Plus and Pro users, GPT-5.6 Sol has been improved to provide more focused answers and more reliable facts, with a new slider allowing users to control how much reasoning the model applies to each response. Free users will now have GPT-5.6 Luna as their default model with unlimited text chats and access to a new Think button for questions requiring deeper reasoning. According to internal evaluations, responses containing factual errors were significantly less common with these updated models compared to the previous version.

Explainer: What Is GPT-5.6? OpenAI's Newest Model Family, Explained

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