Which AI model writes the most bugs in Go?

As of Sep 30, 2026, Claude Opus 5.5 had the highest relative bug rate in Go code (2.52, 152% more counted bugs than the Go average), statistically tied with Claude Fable 5.1.

Updated Sep 30, 2026

Best AI model for Go code

As of Sep 30, 2026, Claude Sonnet 5 had the lowest relative bug rate in Go code (0.18, 82% fewer counted bugs than the Go average), among 7 ranked models.

Models ranked by relative bug rate in Go code. Lower values are better.
Rank	Model	Rate
1	Claude Sonnet 5	0.18
2= (statistically tied)	Claude Opus 4.8	0.78
3= (statistically tied)	GPT-5.6 Sol	0.84
4= (statistically tied)	GPT-6 Astra	0.86
5	Claude Opus 5	1.20
6= (statistically tied)	Claude Fable 5.1	1.87
7= (statistically tied)	Claude Opus 5.5	2.52

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

Other languages

TypeScript
JavaScript
Python
Rust
SQL
Shell
Ruby
Swift
PHP
Vue
Terraform
Kotlin
C#
Svelte
Java
Dart

Questions and answers

Which AI model writes the most bugs in Go?: As of Sep 30, 2026, Claude Opus 5.5 had the highest relative bug rate in Go code (2.52, 152% more counted bugs than the Go average), statistically tied with Claude Fable 5.1.