tech
Improving GPT‑5.6 Sol in ChatGPT—and expanding access to GPT-5.6 Luna for free users
Our mission is to ensure that artificial general intelligence benefits all of humanity. We’re introducing updates to ChatGPT that improve everyday conversations while expanding access for Free users.

TL;DR
- Updates to ChatGPT aim to improve everyday conversations and expand access for free users.
- Plus and Pro users get GPT-5.6 Sol with improved factual reliability and a slider to control response depth.
- Free users will use GPT-5.6 Luna as the default model, with unlimited text chats and a 'Think' button for complex questions.
- GPT-5.6 Sol responses are designed to be more direct, use tighter formatting, and avoid unnecessary detail.
- Internal evaluations show significant reductions in factual errors with GPT-5.6 Luna and GPT-5.6 Sol compared to GPT-5.5 Instant.
- ChatGPT's 'Instant' and 'Thinking' experiences are being unified for a more consistent user experience.
- Safety measures for users under 18 have been reinforced, including age-appropriate boundaries and encouragement of connection with trusted people.
- These updates aim to make AI more accessible, useful, and reliable for a broader audience.