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OpenAI's 'gpt-5.3-codex' model unsupported with ChatGPT accounts

Users are reporting an issue where the 'gpt-5.3-codex' model is not supported when attempting to use Codex with a ChatGPT account. This problem appears to be affecting users who integrate Codex with development environments like VSCode. The community is seeking solutions or explanations for this model incompatibility. AI

IMPACT Potential disruption for developers relying on Codex integration with ChatGPT for coding tasks.

RANK_REASON User-reported issue with a specific model version and product integration.

Read on r/OpenAI →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

COVERAGE [1]

  1. r/OpenAI TIER_2 English(EN) · /u/Analytical_Monk ·

    The 'gpt-5.3-codex' model is not supported when using Codex with a ChatGPT account.

    <!-- SC_OFF --><div class="md"><p>I started running into this earlier today. I am using Codex with VSCode. </p> <p>Is anyone else facing this? If so, what is the solution to use Codex with ChatGPT account? </p> <p>Sorry if this is a repeat issue...</p> </div><!-- SC_ON --> &#32; …