What Actually Happened

OpenAI confirmed that GPT-5.5 will retire from ChatGPT, ChatGPT Work, and Codex on October 14, 2026, across every plan, including consumer, Business, Enterprise, and Edu. Developers using Codex through ChatGPT sign-in are being told to switch from gpt-5.5 to gpt-5.6-sol before that date, or their coding workflows will stop working. Importantly, the retirement does not touch the OpenAI API: anything your business built that calls GPT-5.5 with an API key keeps running as usual.

What Replaces GPT-5.5

  • GPT-5.6 Sol. A more advanced model with stronger coding, research, and analysis capabilities, positioned as the default upgrade path for most GPT-5.5 users.
  • GPT-6 Astra. OpenAI's most advanced model, for teams that want the highest-capability option rather than a like-for-like replacement.
  • The API is unaffected. If your product or internal tool talks to OpenAI's API directly rather than through the ChatGPT interface, this retirement changes nothing for you.
Quick Insight

This is the same pattern that has played out with every prior OpenAI model retirement: a deadline announced weeks in advance, a recommended replacement, and business workflows that quietly stop working for teams who weren't tracking which model they depended on.

What to Check Before October 14

Start with anything your team built on top of ChatGPT rather than the raw API: custom GPTs, saved prompt workflows, and any Codex-based coding setup signed in through ChatGPT. Confirm whether each one is pinned to GPT-5.5 specifically, and if it is, test it against GPT-5.6 Sol before the retirement date rather than after your workflow breaks. The businesses that get caught off guard by model retirements are almost always the ones that never documented which model a given process actually depends on.