The wrong context window size of Cursor Grok 4.5

Support Bug Reports
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1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

Grok 4.5 supports 500k contxt windows size. Howere, the contxt window size of it is only 256k in current version of cursor.

Steps to Reproduce

Just open a session, choose Cursor Grok 4.5 High, you will find it.

Expected Behavior

It should be 500k

Operating System

MacOS

Version Information

Version: 3.10.20
VS Code Extension API: 1.125.0
Commit: 23b9fb205fe595ea2be29da7214e19762d037fc0
Date: 2026-07-07T07:03:33.071Z
Layout: Agent Window
Build Type: Stable
Release Track: Default
Electron: 40.10.3
Chromium: 144.0.7559.236
Node.js: 24.15.0
V8: 14.4.258.32-electron.0
xterm.js: 6.1.0-beta.256
OS: Darwin arm64 25.5.0

For AI issues: which model did you use?

Cursor Grok 4.5

For AI issues: add Request ID with privacy disabled

a940880d-5e24-43dc-925d-c9ee2445d3e2

Does this stop you from using Cursor

No - Cursor works, but with this issue

6

Hi @Li_Chuyang Thank you for the post! Cursor Grok 4.5 has a context window limit of 256k, so it’s working as intended. You may be able to use Grok 4.5 through the SpaceXAI API with a different context window, but in Cursor, Grok 4.5 has a context window of 256k currently.

7

Thanks for answering the problem! Will Cursor set the context window to 500k/1m for the next few months?

8

We’ll announce any model updates here on the forum for sure :smiley:

Thanks again for the post