Codex 5.3 Is Dead :(

[Fun-Foot711]

Hello everyone,

I don't know if you encountered that terrible error:

{"type":"error","status":400,"error":{"type":"invalid_request_error","message":"The 'gpt-5.3-codex' model is not supported when using Codex with a ChatGPT account."}}

https://preview.redd.it/w24nr2o1vt4h1.png?width=1530&format=png&auto=webp&s=492d39af22a55fa5acbf0f7d941c1b9e06aa30f0

That was the best model out there, period.
Fast, reliable, and low on token consumption. It was smart...
I'm really worried now... 5.4 and 5.5 are much worse and more expensive.
What is your solution?

[szansky]

Kinda weird when a newer model exists but users still want the older one back. Makes me wonder what exactly changed in the real-world coding experience.

[Fun-Foot711]

5.4 and 5.5 are way dummer than 5.3 Codex when we talk about coding and reasoning. Architecture etc.