OpenAI announced on August 6 that ChatGPT would receive a major update, with the default model for free users switching to GPT-5.6 Luna and expanded usage rights that include unlimited text chat, according to a CTEE report (E1). TechNews reported that Luna is not the most capable model in the GPT-5.6 lineup; instead, it is positioned to be the fastest-responding, lowest-compute-cost version, designed for high-frequency conversation (E8).
OpenAI's own site states that Luna performs better than the prior free-tier model, GPT-5.5 Instant, and adds a new "Think" button that lets users access higher-level reasoning for more complex questions — a feature that also extends to the entry-level paid plan, ChatGPT Go, per CTEE (E2). This positioning is consistent with TechNews' description of Luna as the speed-and-cost-optimized member of the GPT-5.6 family rather than its most powerful one (E8).
For Plus and Pro paid subscribers, OpenAI introduced the more reliable GPT-5.6 Sol, which CTEE reports provides more precise answers, adjusts the level of detail to match the question, and avoids unnecessary formatting (E3). OpenAI said Sol is less likely to make errors when handling dates, numbers, sources, legal rules, medical information, financial questions, or hypotheticals (E4). TechNews cited OpenAI's official blog, which stated that Sol "is designed to better use the sources it finds to answer questions in order to reduce mistakes, especially when the answer depends on dates, numbers, data sources, rules, or assumptions" (E10).
TechNews reported that OpenAI updated the default model for both free-tier users and subscribers of the entry-level ChatGPT Go plan to GPT-5.6 Luna, which had launched the previous month; starting the following week, these users gain unlimited text chat and access to the new "Think" button for handling harder, more complex questions (E7). This aligns with CTEE's account of the August 6 announcement, which described the rollout of unlimited text chat as part of the same update expanding free-user access (E1).
Despite the model upgrade, CTEE reported that file uploads, image generation, and other ChatGPT tools remain subject to usage limits, and the update does not affect the GPT-5.6 Sol used in Codex or the Work version of ChatGPT (E5). On the other hand, TechNews noted that free users can now pair GPT-5.6 Luna with web search functionality for AI-assisted search, which is intended to improve the quality of everyday queries (E9).
TechNews reported that ChatGPT Plus and Pro subscribers can use a new slider to decide how much thinking effort ChatGPT invests when answering a question, with the slider rolling out to users across platforms starting the day of the announcement (E11). This complements the "Think" button available to free and Go users, which CTEE described as a way to access higher-level reasoning for complex problems (E2).
Alongside the model changes, CTEE reported that OpenAI added extra protective measures for users under 18, imposing stricter restrictions on romantic roleplay, sexual content, dangerous activities, eating disorders, body-image risks, age-restricted goods, and violent content (E6). These safety measures were announced as part of the same broader update in which OpenAI revealed the shift to GPT-5.6 Luna for free users (E1).
Taken together, the reporting shows OpenAI applying different design priorities across its tiers: Luna is built for speed and cost efficiency to support high-frequency, unlimited free-tier conversation (E8, E1, E7), while Sol is built for reliability in fact-sensitive tasks like dates, numbers, and legal or medical questions for paying subscribers (E3, E4, E10). The "Think" button and the Plus/Pro thinking-depth slider extend a similar logic — giving users control over how much reasoning effort a model applies — across both free and paid tiers (E2, E11). At the same time, tool-level restrictions on file uploads and image generation for free users (E5) show that the expanded access announced on August 6 applies specifically to text chat, not to the full ChatGPT toolset, even as new age-based content restrictions were introduced in the same update (E6).
According to TechNews, OpenAI said unlimited text chat for free-tier and ChatGPT Go users would begin the week following the August update announcement (E7).
No. CTEE reported that the update does not affect the GPT-5.6 Sol model used in Codex or the Work version of ChatGPT (E5).
According to CTEE, OpenAI added stricter limits for users under 18 covering romantic roleplay, sexual content, dangerous activities, eating disorders, body-image risks, age-restricted goods, and violent content (E6).
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