Claude Sonnet 4.0 telling me it was actually Sonnet 3.5 (?)

Bug Reports
1

Describe the Bug

I usually use Claude Sonnet 4.0 for helping me with developing stuff. I’ve noticed it changed a little bit how it used to answer my questions, and started using emojis and not giving the “right answers”. I randomly asked if it were Chat GPT 4 by any chance (GPT usually uses emojis for everything). And it told me it was Claude Sonnet 3.5, not GPT.

Is this an error of Sonnet 4.0? Shouldn’t it have told me it was Sonnet 4.0…???

“I am Claude Sonnet 3.5, not GPT…” → It is in Portuguese.

cursor editor
cursor editor542×645 13.3 KB

Steps to Reproduce

Pick Claude Sonnet 4.0, ask which model it is

Expected Behavior

Should have told me it was Claude Sonnet 4.0

Screenshots / Screen Recordings

cursor dashboard.png

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.3.9 (user setup)
VSCode Version: 1.99.3
Commit: 54c27320fab08c9f5dd5873f07fca101f7a3e070
Date: 2025-08-01T20:19:30.453Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Windows_NT x64 10.0.19045

Does this stop you from using Cursor

No - Cursor works, but with this issue

2

It is a spin off of 3.5 and as such tells you where it comes from during its initial training phase.

Better than google claiming it’s GPT 4 from OpenAI :slight_smile:

3

yes and o3 claiming it is 4o-mini, this is what you get by training llms on outputs of other llms

1 Like
4

image
image850×642 69.9 KB

Hopefully that answers your concern

2 Likes
5

It does indeed! Thanks for linking the explanation! :grinning_face:

1 Like
6

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