What are the equivalents for thinking with the new model selector?

<table> <tr><td> <a href="https://www.reddit.com/r/OpenAI/comments/1u2u6bz/new_web_ui_update/"> <img alt="New web UI update"

<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>Theres a pattern where GPT switches from High to medium or instant even if it was deliberately set to high. I have encountered this when creating

<!-- 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

<table> <tr><td> <a href="https://www.reddit.com/r/ChatGPT/comments/1uysuph/anyone_else_see_the_date_of_the_model/"> <img alt="Anyone Else see the Date of the Model?"

<table> <tr><td> <a href="https://www.reddit.com/r/ChatGPT/comments/1s6qlc0/new_model_out/"> <img alt="new model out"

<table> <tr><td> <a href="https://www.reddit.com/r/ChatGPT/comments/1u8fshv/where_is_extended_thinking/"> <img alt="Where is extended thinking?"

<!-- 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