OpenAI is removing automatic model switching for ChatGPT’s free and Go users and will soon give them unlimited text chats. GPT-5.6 Sol UpgradesOpenAI is also updating GPT-5.6 Sol, its flagship model available to Plus and Pro subscribers. OpenAI also says the new GPT-5.6 Sol is designed to make fewer factual mistakes, particularly with numbers, dates, sources, rules and assumptions. ChatGPT Work and Codex Models UnchangedThe GPT-5.6 Sol update will not apply to the version of the model powering ChatGPT Work and Codex. The changes will roll out in stages, with GPT-5.6 Luna arriving for free and Go users this week, followed by unlimited text chats and the new Think button next week.