GITBOOK-550: Added deprecation notice banner to the gpt-4o model page

Author: kristinaorekhova

docs/api-references/text-models-llm/OpenAI/gpt-4o.md

@@ -1,5 +1,10 @@
 # gpt-4o
 
+{% hint style="warning" %}
+**Deprecation notice**\
+`gpt-4o` will be removed from the API on **February 17, 2026**. Please migrate to [`gpt-5.1-chat-latest`](https://docs.aimlapi.com/api-references/text-models-llm/openai/gpt-5-1-chat-latest).
+{% endhint %}
+
 <table data-header-hidden data-full-width="true"><thead><tr><th width="546.4443969726562" valign="top"></th><th width="202.666748046875" valign="top"></th></tr></thead><tbody><tr><td valign="top"><div data-gb-custom-block data-tag="hint" data-style="info" class="hint hint-info"><p>This documentation is valid for the following list of our models:</p><ul><li><code>gpt-4o</code></li><li><code>chatgpt-4o-latest</code></li><li><code>gpt-4o-2024-05-13</code></li><li><code>gpt-4o-2024-08-06</code></li></ul></div></td><td valign="top"><a href="https://aimlapi.com/app/?model=openai/gpt-4o&#x26;mode=chat" class="button primary">Try in Playground</a></td></tr></tbody></table>
 
 ## Model Overview