Tool call failures by GPT 5.1 High in Plan Mode

Hey, thanks for the report. This matches a known bug in the create_plan tool during plan updates - it can hang or time out. Temporary workaround: copy the markdown of the current plan into a new agent window and continue there. See the accepted answer: Cursor planning mode crash

Could you please share:

  • Screenshots of errors from Help > Toggle Developer Tools > Console at the time of the hang
  • The result of launching with extensions disabled: cursor --disable-extensions
  • Whether it reproduces on a different model

I’ll pass this to the team. Let me know if the workaround helps.