Gate News message, April 22 — GPT-5.5 has appeared in the model selector dropdown for OpenAI Codex, positioned at the top of the list.
However, when users select GPT-5.5 and submit a request, Codex returns a 400 error with the message “The ‘gpt-5.5’ model is not supported when using Codex with a ChatGPT account.” The model is currently unavailable. OpenAI has not released any official announcement or documentation regarding GPT-5.5 as of now.
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