Why does ChatGPT use “5.5 instant” when I have 5.6 medium set by default??

<!-- SC_OFF --><div class="md"><p>For me, when I select GPT-5.5 Thinking with Auto-switch off; standard voice generates a response labelled GPT-5.3. If I leave voice mode and use

<!-- SC_OFF --><div class="md"><p>As the title says. I'm getting absolutely no thinking time reported on my prompts, and the answers are coming out completely instant. It feels

<!-- SC_OFF --><div class="md"><p>I normally use 5.6 Medium, but for the past two days I’ve only been getting 5.5 Mini instead. Is anyone else having the same problem?</p>

&#32; submitted by &#32; <a href="https://www.reddit.com/user/Orchid-Delirium2005"> /u/Orchid-Delirium2005 </a> <br /> <span><a

<!-- SC_OFF --><div class="md"><p>I’m on ChatGPT Pro (model 5.5) and I’m noticing something weird: prompts that used to “think” for 20, 30, 40+ minutes now seem to stop after

<table> <tr><td> <a href="https://www.reddit.com/r/OpenAI/comments/1xa60rq/psa_chatgpt_intentionally_swaps_selected_model/"> <img alt="PSA: ChatGPT intentionally swaps selected

<!-- SC_OFF --><div class="md"><p>In the ChatGPT.com browser, I do not see any options for high or xhigh, and am wondering if ChatGPT 5.5 Extended Thinking is actually equivalent

<!-- SC_OFF --><div class="md"><p>Has anyone else had the same problem with 5.5, where it keeps being rerouted to 5.4? The first few days everything was fine, but since yesterday