Selected GPT-5.6 but received 5.5-mini instead; OpenAI acknowledges it is a Bug

Perceive Beating AI News Flash: Recently, ChatGPT paid users discovered that when selecting GPT-5.6 Sol in their Thinking or Pro settings, the responses suddenly became faster and of lower quality. Some users, after inspecting network requests, found that while the frontend requested GPT-5.6, the server actually responded with gpt-5-5-mini.

Adam Fry, the Product Manager of OpenAI's ChatGPT, has confirmed that this was a routing bug. Approximately 3% of Pro and Thinking requests were incorrectly routed to GPT-5.5-mini, which has now been fixed.