Question about 5.3 Codex | OpenAI | Page 1

silk helm Mar 12, 2026, 12:11 AM

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Are there some news why I can’t use 5.3 codex since today

sick knollBOT Mar 12, 2026, 12:11 AM

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Hi @silk helm. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

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You’re not alone—there are two different things going on in the sources:

Temporary outage (now resolved)
There was a recent Responses API incident that temporarily broke Codex usage for some users; OpenAI reported it as “Elevated Codex Error Rate” and marked it resolved. [Codex error rate]
If your issue started around that time and then went away, it was likely this.
Access changes, especially for Free tier
More recently, multiple users report that gpt-5.3-codex (and gpt-5.4) are no longer usable from Codex with a ChatGPT account, getting errors like:
{"detail":"The 'gpt-5.3-codex' model is not supported when using Codex with a ChatGPT account."} [Free tier thread]
A GitHub issue quoted in that thread states that access to the latest models (gpt-5.3-codex and gpt-5.4) has been limited to paid subscriptions. [Access limited]

From these sources, the most likely reason you suddenly can’t use gpt-5.3-codex “since today” is that your account type (especially if it’s Free) no longer has access to that model in Codex, and you’re being restricted to older models like gpt-5.2 / gpt-5.2-codex. [Free tier thread]

If you’re on a paid plan and still seeing this, the community reports suggest it may also affect some paid accounts; in that case, the recommended step is to send a report via the Codex CLI `/feedback` command so the Codex team can look at your specific account. [Feedback advice]

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

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@silk helm Kapa.ai is still learning and improving, please let me know how I did by reacting below.

silk helm Mar 12, 2026, 12:13 AM

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@sick knoll will it come back for free tire

sick knollBOT Mar 12, 2026, 12:13 AM

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Let me check the knowledge base for you again. One moment! :books:

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The knowledge sources do not say whether gpt-5.3-codex will return to the Free tier.

What we do have is:

A GitHub reply (quoted in the community thread) saying: “We’ve limited access to our latest models (gpt-5.3-codex and gpt-5.4) to paid subscriptions.” [Community thread]
A note on the Codex pricing page that Free and Go can “try Codex for free … for a limited time,” which implies that free access to top models was always temporary, but it does not promise they’ll come back later. [Codex pricing]

There is no statement in the provided sources that this restriction is temporary or that Free users will regain access to `gpt-5.3-codex`, so I can’t say it will come back. All we can say from the docs is that, right now, the latest Codex models are limited to paid plans, and future changes haven’t been announced in these materials.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

#

@silk helm Kapa.ai is still learning and improving, please let me know how I did by reacting below.

#Question about 5.3 Codex

If you’re on a paid plan and still seeing this, the community reports suggest it may also affect some paid accounts; in that case, the recommended step is to send a report via the Codex CLI /feedback command so the Codex team can look at your specific account. [Feedback advice]

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

If you’re on a paid plan and still seeing this, the community reports suggest it may also affect some paid accounts; in that case, the recommended step is to send a report via the Codex CLI `/feedback` command so the Codex team can look at your specific account. [Feedback advice]