The last update is hallucinating when writing commit comments

Support Bug Reports
1

Version: 3.15.6
VS Code Extension API: 1.128.0
Commit: a1f686545fd0ce8917bbd2449f733551a9bce420
Date: 2026-08-06T01:41:03.876Z
Layout: IDE
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.291
OS: Linux x64 6.8.0-65-generic

the auto-generated commit comment have nothing to do with the changed made

2

Hi there!

We detected that this may be a bug report, so we’ve moved your post to the Bug Reports category.

To help us investigate and fix this faster, could you edit your original post to include the details from the template below?

Bug Report Template - Click to expand

Where does the bug appear (feature/product)?

  • Editor, Tab & Chat (autocomplete, Composer, in-editor agent)
  • Terminal & commands
  • Models, pricing & API keys (availability, Auto/Max, BYOK/Bedrock)
  • MCP & tools
  • Cloud Agents & Automations (cursor.com/agents, scheduled/event)
  • BugBot & Code Review
  • Cursor CLI
  • Cursor Mobile
  • Remote (SSH / Dev Containers / WSL)
  • Account, billing & login
  • Something else…

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Steps to Reproduce
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  1. …
  2. …
  3. …

Expected Behavior
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Operating System

  • Windows 10/11
  • MacOS
  • Linux

Version Information

  • For Cursor IDE: Menu → About Cursor → Copy
  • For Cursor CLI: Run agent about in your terminal
IDE:
Version: 2.xx.x
VSCode Version: 1.105.1
Commit: ......

CLI:
CLI Version 2026.01.17-d239e66

For AI issues: which model did you use?
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Request ID: f9a7046a-279b-47e5-ab48-6e8dc12daba1
For Background Agent issues, also post the ID: bc-…

Additional Information
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Does this stop you from using Cursor?

  • Yes - Cursor is unusable
  • Sometimes - I can sometimes use Cursor
  • No - Cursor works, but with this issue

The more details you provide, the easier it is for us to reproduce and fix the issue. Thanks!

6

Hey, thanks for the report. Good news: this isn’t related to the 3.15.6 update, and it’s not something in your setup. The Generate Commit Message feature has worked like this for a long time.

A few details that explain the off-target messages:

  • The feature uses a simplified fast model, not the main agent model.
  • Large diffs get hard-trimmed (about 8K characters per file, 50K total), so on big commits the model literally can’t see most of the changes.
  • It also looks at the last 10 commit messages for style, and sometimes the weaker model leans on those and describes past work instead of the new diff.

What helps in practice:

  • Commit in smaller chunks. Stage and commit small sets of files.
  • Regenerate the message only after you’ve staged exactly the files you’re going to commit. Unstaged edits in those same files can get mixed into the context.

We’re working on model and prompt improvements for this feature, but there’s no exact timeline yet. If you can, please share one concrete example: the rough size or content of the diff and the message it generated. That’ll help us tell if this is the usual limitation or something new.