ChatGPT Revolutionizes Free Access with GPT-5.6 Luna and Sol

ChatGPT: Improvements and New Features with GPT-5.6 Sol and Luna

The goal of ChatGPT is to ensure that general artificial intelligence is beneficial for all of humanity. In this context, significant updates have been introduced to enhance daily interactions and broaden access for free users.

For Plus and Pro subscribers, GPT-5.6 Sol has been updated to provide increased factual reliability and more targeted responses. An innovative slider now allows users to adjust the level of thought that ChatGPT dedicates to each response.

Free users benefit from an update to the default model to GPT-5.6 Luna, which includes unlimited text discussions. For questions requiring deeper thought, a new Think button is available, allowing for more detailed reasoning.

GPT-5.6 Sol: A Response Tailored to Your Needs

Every week, around 1 billion people use ChatGPT for various tasks ranging from quick questions to complex planning. GPT-5.6 Sol has been optimized to cater to this diversity of uses, offering more targeted and contextually appropriate responses.

More Targeted Responses

The improvements made to GPT-5.6 Sol aim to provide direct and well-formatted answers, avoiding unnecessary details. For a simple question, this means a concise response with the necessary context. For more complex tasks, such as planning or research, the answers are more detailed while keeping the essentials clear.

Example of a Response

Question: Can I bike from Mission to Ocean Beach after work today without getting wet?

GPT-5.5 Instant: Probably yes. According to today’s forecast, I would expect you to stay dry on your ride from Mission to Ocean Beach after work.

GPT-5.6 Sol: Yes — you should stay dry. There is essentially no rain expected after work today. The main factor is the wind: expect a notable headwind, with west winds around 10–20 mph and potentially stronger gusts.

GPT-5.6 Sol stands out for its ability to identify wind as the main obstacle, thus providing a more relevant response for the cyclist.

Increased Factual Reliability

A helpful response must be factually correct. GPT-5.6 Sol has been designed to reduce errors, particularly when responses rely on precise data such as dates, numbers, or rules. In an internal evaluation, factual errors were reduced by 62% with GPT-5.6 Luna and by 68% with GPT-5.6 Sol compared to GPT-5.5 Instant.

Consistent User Experience

The update brings the Instant and Thinking experiences of ChatGPT closer together, ensuring a uniform tone and behavior across different types of conversations. Plus and Pro users can adjust the level of thought via a slider available on all platforms.

Broadened Access for Free Users

Access to the latest models is extended to free users, who can now enjoy unlimited text discussions with GPT-5.6 Luna. A new Think button also allows for deeper reasoning on complex questions.

Safety and Availability

Plus and Pro users have access to GPT-5.6 Sol and the slider starting today. GPT-5.6 Luna becomes the default model for free users this week, with unlimited discussions and a Think button available from next week, subject to safeguards against abuse.

This version of GPT-5.6 Sol is optimized for daily interactions and is exclusively available in the ChatGPT Chat experience. The versions used for Work and Codex are not affected by this update.

Towards More Accessible Intelligence

These improvements represent a step towards more accessible and abundant artificial intelligence. By making the latest models available to a broader audience, ChatGPT enhances the utility and reliability of responses, allowing free users to continue their discussions without restriction. Access to these technologies shapes opportunities, offering everyone the chance to ask questions, develop ideas, and get help when needed.