Day Three of GPT-5.6 Sol Silently Falling Back to GPT-5.5-mini, With No Acknowledgment From OpenAI
r/ChatGPT (45 upvotes, 44 comments); corroborated by r/OpenAI and four OpenAI Developer Community bug threads·high signal
Plus subscribers report that selecting GPT-5.6 Sol at High reasoning returns near-instant, shallow answers, and that the assistant identifies itself as GPT-5.5-mini while the model picker still reads Sol. The r/ChatGPT day-three thread and a separate r/OpenAI report are matched by at least four distinct bug reports on community.openai.com covering Sol, 5.6 Pro and 5.6 Thinking, all filed in the past week. For anyone benchmarking or building against the ChatGPT surface, the selected model is not currently a reliable statement of what served the response.