ChatGPT-5 Can't Do Basic Math

9 MarcellusDrum 2 8/8/2025, 7:07:18 PM
ChatGPT-4 can solve it them. Even using GPT-5 from the API gives the correct result. Something with the ChatGPT frontend prompt seems to be the issue.

Example:

Prompt: Solve 5.9=x+5.11

Answer:

To solve the equation:

5.9 = x + 5.11

Subtract 5.11 from both sides:

5.9 - 5.11 = x

-0.21 = x

Final answer:

\boxed{x = -0.21}

Comments (2)

ishita159 · 1m ago
i tried this and a variation of this a bunch of times. got the right answer every time.

i asked about 10 of my friends and they all got the right answers as well.

is it just people trying to get views on X or is it actually happening?

simpleintheory · 22m ago
Can confirm this is happening with the same prompt -- it even tries to justify that 5.9 is less than 5.11 when asked further.

[1] https://chatgpt.com/share/689652e0-c2ac-8004-811b-0856a76fe2...