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… Terra is similar in performance to GPT–5.5 but it is 2x cheaper, and Luna offers "strong capability" at OpenAI's lowest price. GPT–5.6 Sol is OpenAI's strongest model to date, with agentic improvements in coding, biology, and cybersecurity. …
Free ChatGPT Users Get Unlimited Text Chats and GPT-5.6 Luna Thursday August 6, 2026 11:52 am PDT by Juli Clover OpenAI today said it is making GPT–5.6 Luna the default model for Free and Go ChatGPT users, giving them access to a newer, more capable model to replace GPT–5.5 Instant. …
… GPT–5.6 is available across ChatGPT, Codex, and the OpenAI API starting today. GPT–5.6 Sol is available for Plus, Pro, Business, and Enterprise users. Free and Go users have access to GPT–5.6 Terra. ChatGPT Work is available today for Pro, Enterprise, and Edu plans. …
… GPT-5.5 has standard safeguards for general purpose use, while GPT-5.5 with Trusted Access for Cyber is meant for verified defensive work in authorized environments. GPT-5.5-Cyber is for specialized authorized workflows, and it features stronger verification and account-level controls. …
… All ChatGPT models are being updated with memory sources, which will show users the past chats, files, and other context that ChatGPT used to generate a response. GPT-5.5 Instant is rolling out today to all ChatGPT users, and it is replacing GPT-5.3 Instant as the default model. …
… ChatGPT Gets GPT-5.3 Instant Update With Less 'Cringe,' Fewer Hallucinations OpenAI today updated its most popular ChatGPT model, debuting GPT-5.3 Instant. GPT-5.3 Instant is supposed to provide more accurate answers and better contextualized results when searching the web. …
… ChatGPT Gets GPT-5.3 Instant Update With Less 'Cringe,' Fewer Hallucinations OpenAI today updated its most popular ChatGPT model, debuting GPT-5.3 Instant. GPT-5.3 Instant is supposed to provide more accurate answers and better contextualized results when searching the web. …