OpenAI has updated its models behind ChatGPT, removing the rate limit on text conversations for free users and adding new safeguards for teens. The company has introduced GPT-5.6 Sol for Plus and Pro subscribers and GPT-5.6 Luna for free users.
The update aims to deliver more focused answers and adapt the level of detail to the question. A new slider lets users set how much reasoning effort the model uses for a response.
OpenAI reports that the update cuts down on factual mistakes. In an internal test, answers containing at least one factual error were about 62 percent less common with Luna and 68 percent less common with Sol compared to the outgoing GPT-5.5 Instant model.
Free and Go tier users are being moved to GPT-5.6 Luna as their default model this week. Starting next week, OpenAI will remove the rate limit on text chats and add a new “Think” button for deeper reasoning on harder questions.
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They will keep the chats subject to what OpenAI calls “abuse guardrails,” while limits remain in place for file uploads, images, and other tools. Plus and Pro subscribers can already use the updated Sol model and its new slider.
OpenAI has expanded GPT-5.6 safeguards for younger users. The company trained GPT-5.6 Sol to avoid romantic roleplay, age-restricted challenges, and responses that present the assistant as a replacement for relationships with people.
It also added age-related boundaries covering sexual material, eating disorders, body-image risks, age-restricted goods, dangerous activities, and graphic violence. When a teen may need support, the model is meant to encourage connection with trusted people.
The company reinforced this training with system-level protections and has added new evaluations for how its models perform for users under 18. OpenAI is continuing to improve model responses in this area.
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OpenAI tested GPT-5.6 models against adversarial prompts designed to bypass refusal training and produce harmful assistance. The evaluation used challenging multiturn jailbreaks derived from internal red-teaming and excluded additional production safeguards.
According to the report, GPT-5.6 Sol performed comparably to recent predecessors and was similar to GPT-5.5 Thinking. The company also tested resistance to attacks that embed adversarial instructions in tool output in an attempt to override system, developer, or user instructions.
The tests included stronger attacks targeting search and function-calling. GPT-5.6 Sol scored 1.000 on the connector evaluation, matching GPT-5.5 and up from 0.998 for GPT-5.4 Thinking. On the separate search and function-calling evaluation, Sol scored 0.910.
These updates and safeguards demonstrate OpenAI’s commitment to improving the safety and reliability of its models, particularly for younger users.
