OpenAI is giving Plus and Pro users a more focused GPT-5.6 Sol and a slider for adjusting response depth. Free users will get unlimited text chats with the cheaper GPT-5.6 Luna.
OpenAI says GPT-5.6 Sol now cuts unnecessary detail and excess formatting. For simple questions, it delivers a direct answer with just enough context, while more complex tasks get a fuller response that still makes the key recommendation easy to spot.
The company also claims better factual accuracy. In an internal evaluation using finance, medicine, and law prompts, responses with at least one factual error fell about 62 percent for GPT-5.6 Luna and 68 percent for GPT-5.6 Sol compared with GPT-5.5 Instant. Those figures haven't been independently verified.
The update only applies to ChatGPT. GPT-5.6 Sol remains unchanged in ChatGPT Work and Codex.
Paying users get more control over reasoning
