Which AI model writes the most bugs in Cursor?

As of Nov 9, 2026, Claude Opus 5.5 had the highest relative bug rate in Cursor (2.47, 147% more counted bugs than the all-model average).

How much AI-written code comes from Cursor?

Cursor wrote 1.9% of the AI-written code reviewed by cubic in the week of Nov 2, 2026.

Updated Nov 9, 2026

Best AI model for Cursor

As of Nov 9, 2026, Grok 4.7 had the lowest relative bug rate in Cursor (1.59, 59% more counted bugs than the all-model average), among 2 ranked models.

Models ranked by relative bug rate for code written in Cursor. Lower values are better.
Rank	Model	Rate
1	Grok 4.7	1.59
2	Claude Opus 5.5	2.47

1.00 = all-model average · lower is better

How widely Cursor is used

Share of AI-written code reviewed by cubic

Latest weekWeek of Nov 2: 1.9%
Peak weekWeek of Aug 17: 10.6%

Other coding agents

Claude Code
Codex

Questions and answers

Which AI model writes the most bugs in Cursor?: As of Nov 9, 2026, Claude Opus 5.5 had the highest relative bug rate in Cursor (2.47, 147% more counted bugs than the all-model average).
How much AI-written code comes from Cursor?: Cursor wrote 1.9% of the AI-written code reviewed by cubic in the week of Nov 2, 2026.