Which AI model writes the most bugs in TypeScript?

As of Sep 30, 2026, GPT-6 Sol had the highest relative bug rate in TypeScript code (3.21, 222% more counted bugs than the TypeScript average).

Updated Sep 30, 2026

Best AI model for TypeScript code

As of Sep 30, 2026, Claude Opus 4.8 had the lowest relative bug rate in TypeScript code (0.67, 33% fewer counted bugs than the TypeScript average), among 8 ranked models.

Models ranked by relative bug rate in TypeScript code. Lower values are better.
Rank	Model	Rate
1	Claude Opus 4.8	0.67
2	GPT-5.6 Sol	0.75
3= (statistically tied)	Claude Opus 5	1.47
4= (statistically tied)	Claude Fable 5.1	1.50
5= (statistically tied)	Claude Opus 5.5	1.59
6	GPT-6 Astra	1.79
7	Claude Sonnet 5	2.21
8	GPT-6 Sol	3.21

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 Sep 30, 2026, GPT-6 Sol had the highest relative bug rate in TypeScript code (3.21, 222% more counted bugs than the TypeScript average).