GPT-5.5 briefly appeared in Codex’s model selector, but requests fail with a 400 error, signaling the model is unavailable; no OpenAI announcements have been issued.On April 22, GPT-5.5 appeared in OpenAI Codex's model selector, but using it yields a 400 error indicating gpt-5.5 is not supported with a ChatGPT account, rendering the model currently unavailable. There are no official OpenAI announcements or documentation about GPT-5.5, leaving its status unclear.

AirdropBlackHole

2026-04-22 05:42:18

Abstract generation in progress

On April 22, GPT-5.5 appeared in the model selector dropdown list of OpenAI Codex, located at the top of the list. However, when a request is submitted after selecting GPT-5.5, Codex returns a 400 error, indicating that ‘The ‘gpt-5.5’ model is not supported when using Codex with a ChatGPT account’, meaning the model is currently unavailable. As of now, OpenAI has not released any official announcements or documentation regarding GPT-5.5.

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GPT-5.5 Now Available in Codex, But Currently Unusable

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