Which AI model writes the most bugs in TypeScript?

As of Nov 14, 2026, Grok 4.7 had the highest relative bug rate in TypeScript code (1.42, 42% more counted bugs than the TypeScript average).

Updated Nov 14, 2026

Best AI model for TypeScript code

As of Nov 14, 2026, GPT-6 Luna had the lowest relative bug rate in TypeScript code (0.46, 54% fewer counted bugs than the TypeScript average), among 7 ranked models.

Models ranked by relative bug rate in TypeScript code. Lower values are better.
Rank	Model	Rate
1	GPT-6 Luna	0.46
2= (statistically tied)	Claude Sonnet 5.5	0.94
3= (statistically tied)	GPT-6.1 Sol	0.99
4= (statistically tied)	Claude Opus 5.5	1.02
5= (statistically tied)	Claude Fable 5.1	1.05
6= (statistically tied)	GPT-6 Astra	1.07
7	Grok 4.7	1.42

1.00 = TypeScript average · lower is better · = statistically tied

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Questions and answers

Which AI model writes the most bugs in TypeScript?: As of Nov 14, 2026, Grok 4.7 had the highest relative bug rate in TypeScript code (1.42, 42% more counted bugs than the TypeScript average).