Which AI model writes the most bugs in SQL?

As of Sep 30, 2026, Claude Opus 5 had the highest relative bug rate in SQL code (3.06, 206% more counted bugs than the SQL average), statistically tied with Claude Sonnet 5 and Claude Opus 5.5.

Updated Sep 30, 2026

Best AI model for SQL code

As of Sep 30, 2026, GPT-5.6 Sol had the lowest relative bug rate in SQL code (0.38, 62% fewer counted bugs than the SQL average), statistically tied with Claude Opus 4.8, among 7 ranked models.

Models ranked by relative bug rate in SQL code. Lower values are better.
Rank	Model	Rate
1= (statistically tied)	GPT-5.6 Sol	0.38
2= (statistically tied)	Claude Opus 4.8	0.52
3= (statistically tied)	GPT-6 Astra	0.93
4= (statistically tied)	Claude Fable 5.1	1.22
5= (statistically tied)	Claude Sonnet 5	2.20
6= (statistically tied)	Claude Opus 5.5	2.65
7= (statistically tied)	Claude Opus 5	3.06

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

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Questions and answers

Which AI model writes the most bugs in SQL?: As of Sep 30, 2026, Claude Opus 5 had the highest relative bug rate in SQL code (3.06, 206% more counted bugs than the SQL average), statistically tied with Claude Sonnet 5 and Claude Opus 5.5.