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OpenAI improves GPT-5.6 Sol in ChatGPT and restricts free users to its weakest model
OpenAI has introduced an improved version of its AI model, GPT-5.6 Sol, exclusively for Plus and Pro users of ChatGPT, allowing for enhanced focus in responses and a new adjustable depth feature. Free users, however, will have access limited to the weaker GPT-5.6 Luna, which opens up discussions about accessibility and the potential trade-offs in AI responsiveness and accuracy. The changes are also reflective of OpenAI's effort to streamline the usage experience, aiming for a singular model feel rather than fragmented options.
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Published 6 Aug 2026, 20:10 UTC2 min read
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Summary
TL;DR
- GPT-5.6 Sol improves response focus and factual accuracy for paying users.
- Free users will have access to GPT-5.6 Luna with limited capabilities.
- Upgraded response depth feature allows personalized interaction.
- Reported factual errors decreased by 62% for Luna and 68% for Sol.
- Free model may risk being less reliable in complex queries.
Interesting facts
- The slider for response depth lets users customize how detailed responses are.
- GPT-5.6 Luna will default for free users, limiting access to stronger models.
- Concerns exist about user engagement with the new controls introduced.