OpenAI has updated ChatGPT's default model for free users to GPT-5.6 Luna, replacing GPT-5.5 Instant. This new model reportedly reduces factual errors by approximately 62% compared to its predecessor. Additionally, free users will have unlimited access to GPT-5.6 Luna, and a new 'Think' button will allow for deeper processing on complex queries. Paid users will also see enhancements to GPT-5.6 Sol, with adjustable response times and improved factual accuracy. AI
IMPACT Expands access to a more capable model for free users and enhances response quality and speed for all.
RANK_REASON Frontier-lab model release with system card and expanded access details. [lever_c_demoted from frontier_release: ic=1 ai=1.0]
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