Why was the GPT-5.4 model discontinued earlier than the 5.3 model?

<!-- SC_OFF --><div class="md"><p>After o3 leaves on the 26th, will there be an o4? Or is that it?</p> <p>Also is this model the longest that has remained active for? It

<!-- 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>What the hell is this? First 4o gone and now 5.2? I really preferred it to 5.3, so now we just cannot select a model? This is really annoying

<a href="https://news.ycombinator.com/item?id=47894000">Comments</a>

<table> <tr><td> <a href="https://www.reddit.com/r/OpenAI/comments/1wwq6yn/openai_publishes_a_model_guide_for_the_gpt6/"> <img alt="OpenAI publishes a model guide for the GPT-6

<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

<table> <tr><td> <a href="https://www.reddit.com/r/LocalLLaMA/comments/1v258lo/openai_released_gptoss_350_days_ago_will_we_ever/"> <img alt="OpenAI released gpt-oss 350 days ago.

<table> <tr><td> <a href="https://www.reddit.com/r/LocalLLaMA/comments/1ws67x4/gpt3_is_discontinued_today/"> <img alt="GPT-3 is discontinued today"