On October 14, 2026, at 22:00 Kyiv time (19:00 UTC), GPT-5.5 retired from Codex for users signed in with ChatGPT. This is the effective date of the change OpenAI announced on September 14. The official changelog explicitly says the OpenAI API and Codex sessions authenticated with an API key are unaffected.
Who should check their settings
Small-business owners and teams using Codex for work who explicitly saved gpt-5.5 as their model choice. OpenAI’s model guidance recommends reviewing defaults and saved settings, configurations, custom agents, scheduled tasks and commands containing that identifier.
Changing a model name in a setting does not grant access to it. OpenAI recommends GPT-6.1 Sol for Plus, Pro, Business, Enterprise and Edu where available in the client; for Free and Go, it recommends GPT-6 Luna in the desktop app where available. Organization settings may also restrict the choice.
A practical sequence
Our editorial recommendation: ask the automation owner to check one real workflow before moving every task.
- Establish the sign-in method and whether GPT-5.5 is explicitly selected.
- Check an available replacement in the client the team uses, then update the relevant saved settings.
- Run a safe test with non-confidential data. Check the content of the result, not just whether the task finishes, before using it.
For example, with a draft weekly report, compare its facts and omissions with the input data. This is an illustrative checking scenario, not a Nadali test result.
The takeaway: this change concerns a specific model and sign-in method. Check saved selections and replacement availability; do not assume that changing a default updated every individual task.
