GPT-5.5 retirement in Codex
The OpenAI Codex changelog includes an entry titled "GPT-5.5 retirement in Codex," published on October 14, 2026, according to the changelog URL fragment. The source text supplied for this item is largely the surrounding changelog page structure: navigation for ChatGPT and Codex changelogs, a link to the complete documentation index at llms.txt, and a note that Markdown versions of documentation pages can be obtained by appending .md to the page URL. It also contains interface elements such as "Start searching," "API," "Dashboard," and "Try ChatGPT." Beyond the entry title and date, the excerpt does not state what the retirement involves, which model replaces GPT-5.5 in Codex, whether a deprecation window applies, or what developers using GPT-5.5 in Codex should do. No pricing, benchmark, context-window, or performance values appear in the provided text. The only concrete documentation detail present is the .md URL convention for retrieving Markdown versions of documentation pages.
The changelog records a GPT-5.5 retirement in Codex, signaling that developers relying on that model in Codex should check the changelog for details.