Gpt-5-high-fast model experiencing performance degradation issues

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

In the last 4 hours, the model has been outputting blank values, with issues related to the “lazy” encoding and decreased ability to execute tests.

Steps to Reproduce

Let the model follow the instructions in todos and execute the tests

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.5.11 (user setup)
Commit: 1.99.3
Data: 2f2737de9aa376933d975ae30290447c910fdf40
Electron: 2025-09-05T03:48:32.332Z
ElectronBuildId: 34.5.8
Chromium: undefined
Node.js: 132.0.6834.210
V8: 20.19.1
OS: 13.2.152.41-electron.0

For AI issues: which model did you use?

gpt-5-high-fast

Does this stop you from using Cursor

No - Cursor works, but with this issue

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