OpenAI said it will set the default model for free users to GPT-5.6 Luna and expand access with unlimited text chat. It is updating GPT-5.6 Sol for Plus and Pro subscribers to improve factual reliability and answer precision, and has updated GPT-5.6 Sol in ChatGPT to deliver more direct replies, tighter formatting and fewer extraneous details.

2026-08-07

OpenAI said it will set the default model for free users to GPT-5.6 Luna and expand access with unlimited text chat. It is updating GPT-5.6 Sol for Plus and Pro subscribers to improve factual reliability and answer precision, and has updated GPT-5.6 Sol in ChatGPT to deliver more direct replies, tighter formatting and fewer extraneous details.