Which AI model writes the most bugs in Dart?

As of Sep 30, 2026, Claude Opus 5 had the highest relative bug rate in Dart code (1.43, 43% more counted bugs than the Dart average).

Updated Sep 30, 2026

Best AI model for Dart code

As of Sep 30, 2026, Claude Opus 4.8 had the lowest relative bug rate in Dart code (0.64, 36% fewer counted bugs than the Dart average), among 2 ranked models.

Models ranked by relative bug rate in Dart code. Lower values are better.
Rank	Model	Rate
1	Claude Opus 4.8	0.64
2	Claude Opus 5	1.43

1.00 = Dart average · lower is better

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Questions and answers

Which AI model writes the most bugs in Dart?: As of Sep 30, 2026, Claude Opus 5 had the highest relative bug rate in Dart code (1.43, 43% more counted bugs than the Dart average).