Which AI model writes the most bugs in SQL?

As of Nov 14, 2026, Claude Fable 5.1 had the highest relative bug rate in SQL code (1.11, 11% more counted bugs than the SQL average), statistically tied with Claude Opus 5.5 and GPT-6 Astra.

Updated Nov 14, 2026

Best AI model for SQL code

As of Nov 14, 2026, GPT-6 Luna had the lowest relative bug rate in SQL code (0.00, 100% fewer counted bugs than the SQL average), statistically tied with Claude Sonnet 5.5 and GPT-6.1 Sol, among 6 ranked models.

Models ranked by relative bug rate in SQL code. Lower values are better.
Rank	Model	Rate
1= (statistically tied)	GPT-6 Luna	0.00
2= (statistically tied)	Claude Sonnet 5.5	0.12
3= (statistically tied)	GPT-6.1 Sol	0.34
4= (statistically tied)	Claude Opus 5.5	0.73
5= (statistically tied)	GPT-6 Astra	0.91
6= (statistically tied)	Claude Fable 5.1	1.11

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 Nov 14, 2026, Claude Fable 5.1 had the highest relative bug rate in SQL code (1.11, 11% more counted bugs than the SQL average), statistically tied with Claude Opus 5.5 and GPT-6 Astra.