"Claude Sonnet 4.5 is not available in the slow pool. Please switch to auto or Auto."

[emi1699 (Emi Buliga)]

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Getting this error: “Claude Sonnet 4.5 is not available in the slow pool. Please switch to auto or Auto.” for any custom model I’m trying to use and if I’m trying to use auto mode, I’m getting "Model name is not valid: “auto”.

Steps to Reproduce

Literally just try to chat with any model.

Operating System

MacOS

Version Information

Version: 2.4.31 (Universal)
VSCode Version: 1.105.1
Commit: 3578107fdf149b00059ddad37048220e41681000
Date: 2026-02-08T07:42:24.999Z
Build Type: Stable
Release Track: Default
Electron: 39.2.7
Chromium: 142.0.7444.235
Node.js: 22.21.1
V8: 14.2.231.21-electron.0
OS: Darwin arm64 25.2.0

For AI issues: which model did you use?

Sonnet, Opus, Codex, it doesn’t matter, it’s all the same.

Does this stop you from using Cursor

Yes - Cursor is unusable

[dvv101111]

Same here with ultra subscription. What does this mean?

[emi1699 (Emi Buliga)]

It means Cursor is down.

[dvv101111]

Forever?

[Jomei]

Its the same for GPT 5.3

[emi1699 (Emi Buliga)]

Lol no just for now

[skrzypekPL]

Same problem. Started about 30 minutes ago. Ultra plan.

[lev-goryachev]

Same for all models on Win. Ultra plan.

[savicbo (Bojan)]

+1 even with Composer 1.5, also on Ultra plan like other in case that’s a factor

Version: 2.4.35
VSCode Version: 1.105.1
Commit: d2bf8ec12017b1049f304ad3a5c8867b117ed830
Date: 2026-02-10T02:46:56.793Z
Build Type: Stable
Release Track: Early Access
Electron: 39.2.7
Chromium: 142.0.7444.235
Node.js: 22.21.1
V8: 14.2.231.21-electron.0
OS: Darwin arm64 25.2.0

[Mat_Kordasiewicz]

Yup, tried codex & opus. Auto kinda works, but it also reports “Get faster response → set new limit“

[dan_the_dev]

Same here. Ultra plan. Currently have 3% of my monthly quota used. Seeing error message stating “Total usage limit reached”

[Politta]

Same issue here. Switching to auto works, but the message about getting faster responses stay.

[salehk]

I am having this issue as well, I also keep getting a “Set New Limit” message even though I have a limit set

[skrzypekPL]

aaaaaannnnnddddd crashed xD

[Victor_Zhang]

same here

[lx-0 (Alex Wegener)]

same same

[Bruno_Henrique_Vigo]

same here

[Cyber_gilly]

Yup, same thing is happening with me as well. Happens when I try to use any model

[huynh_ductrung]

same issue here, ultra plan.
Have anyone try/compare cursor Ultra plan vs Claude Max 20x? pros, cons, credit?
asking because I only need Opus Model. I got 2 credit issues with cursor within 10 days

[Eversom_Camilo]

Same!!! wtf