OpenAI has updated GPT-5.6 Sol in ChatGPT to provide more focused answers, stronger factual reliability, and greater consistency between quick responses and deeper reasoning.
Internal evaluations found factual errors were about 68% less common with GPT-5.6 Sol than GPT-5.5 Instant on selected financial, medical, and legal prompts. Plus and Pro users also gain a slider for controlling how much thought the model applies to responses.
OpenAI is making GPT-5.6 Luna the default for Free and Go users, with unlimited text chats and a new Think button for questions requiring deeper reasoning, subject to abuse safeguards.
