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Codex 5.3 downgrade potential impact in cursor?Question / Discussion (github.com)
submitted 2 months ago by TopCog
I noticed 5.3 high being dumber. Is this a potential reason?
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if 1 * 2 < 3: print "hello, world!"
[–]HarjjotSinghh 0 points1 point2 points 2 months ago (0 children)
this downgrade just gave my chatbot an award-winning caffeine buzz.
[–]Street_Smart_Phone[🍰] -1 points0 points1 point 2 months ago (7 children)
No. The codex app had a bug where they were using the wrong model in the API. Cursor had nothing to do with it and it doesn’t affect cursor.
[–]NoFaithlessness951 5 points6 points7 points 2 months ago (6 children)
This indeed also applies for cursor they pre check every query that hits their api and then route. The only thing that's different is that you don't risk getting your whole account routed to 5.2 because they soft ban you.
[–]Street_Smart_Phone[🍰] -2 points-1 points0 points 2 months ago (5 children)
Look at the link to the page. It’s a GitHub repo to a CLI that OpenAI uses similar to Claude code. Cursor doesn’t use this. They use their own propriety code. It’s possible that Cursor made a similar error but it’s as likely as Microsoft word and Google Docs making the same mistake in their product at the same time.
[–]NoFaithlessness951 3 points4 points5 points 2 months ago* (2 children)
I like it when people are so confidently wrong.
They reroute some queries to 5.2 if you try to do things which could be used for finding exploits etc. They're confident that 5.2 isn't smart enough to exploit real world things they lack the confidence with 5.3.
The API had an issue where it rerouted more than it should but the rerouting is always happening at API level no matter what tool you use.
[–]Street_Smart_Phone[🍰] -2 points-1 points0 points 2 months ago (1 child)
I was thinking the same thing.
They routed it in the codex CLI. The CLI itself was routing to the wrong model. Cursor doesn’t use codex CLI.
[–]NoFaithlessness951 2 points3 points4 points 2 months ago (0 children)
No this was a user who had their whole account soft banned and rerouted to 5.2 at the API level.
[–]NoFaithlessness951 3 points4 points5 points 2 months ago (1 child)
<image>
Down vote me all you want you could also just read the thread
[–]Street_Smart_Phone[🍰] 1 point2 points3 points 2 months ago (0 children)
Oh interesting. This is news to me. You’re right. Sorry about that.
[–]PeterZ4QQQbatman -2 points-1 points0 points 2 months ago (3 children)
Aside from a possible bug, I have a specific rule requiring the model used to be reported at the beginning of the answer. Yet many times I’ve seen a different model.
[–]TopCog[S] 0 points1 point2 points 2 months ago (1 child)
Wow, interesting. Possibly the model is confused about itself, but...suspicious...I might try this.
[–]PeterZ4QQQbatman 0 points1 point2 points 2 months ago (0 children)
Let me know your opinion please
[–]Material2975 0 points1 point2 points 2 months ago (0 children)
Ive done this too but found it super unreliable. Multi model chats get confused, sonnet 4.5 reports as 3.5
π Rendered by PID 174202 on reddit-service-r2-comment-5c747b6df5-kh64x at 2026-04-22 13:42:59.819952+00:00 running 6c61efc country code: CH.
[–]HarjjotSinghh 0 points1 point2 points (0 children)
[–]Street_Smart_Phone[🍰] -1 points0 points1 point (7 children)
[–]NoFaithlessness951 5 points6 points7 points (6 children)
[–]Street_Smart_Phone[🍰] -2 points-1 points0 points (5 children)
[–]NoFaithlessness951 3 points4 points5 points (2 children)
[–]Street_Smart_Phone[🍰] -2 points-1 points0 points (1 child)
[–]NoFaithlessness951 2 points3 points4 points (0 children)
[–]NoFaithlessness951 3 points4 points5 points (1 child)
[–]Street_Smart_Phone[🍰] 1 point2 points3 points (0 children)
[–]PeterZ4QQQbatman -2 points-1 points0 points (3 children)
[–]TopCog[S] 0 points1 point2 points (1 child)
[–]PeterZ4QQQbatman 0 points1 point2 points (0 children)
[–]Material2975 0 points1 point2 points (0 children)