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

By PulseAugur Editorial · [1 sources] ·

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 →

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

How we ranked this

Signal score
0 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
User-reported issue with a specific model version and product integration.
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
product, other
Editorial topic classification. Feeds into how the story surfaces on /topic/<slug> hub pages and into the per-entity coverage mix.
AI-industry relevance
High
Clearly on-topic for AI-industry coverage.
Story freshness
114 days old
Aged out of breaking-news scoring windows; ranking reflects the durable signal from the full source set.

Full methodology in our editorial standards.

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; …

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