Which AI model writes the most bugs in Rust?

As of Sep 30, 2026, Claude Opus 5 had the highest relative bug rate in Rust code (1.73, 73% more counted bugs than the Rust average), statistically tied with Claude Fable 5.1.

Updated Sep 30, 2026

Best AI model for Rust code

As of Sep 30, 2026, Claude Sonnet 5 had the lowest relative bug rate in Rust code (0.61, 39% fewer counted bugs than the Rust average), statistically tied with 5 other models, among 7 ranked models.

Models ranked by relative bug rate in Rust code. Lower values are better.
Rank	Model	Rate
1= (statistically tied)	Claude Sonnet 5	0.61
2= (statistically tied)	GPT-6 Astra	0.61
3= (statistically tied)	GPT-5.6 Sol	0.66
4= (statistically tied)	Claude Opus 5.5	0.74
5= (statistically tied)	Claude Opus 4.8	1.01
6= (statistically tied)	Claude Fable 5.1	1.28
7= (statistically tied)	Claude Opus 5	1.73

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

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Questions and answers

Which AI model writes the most bugs in Rust?: As of Sep 30, 2026, Claude Opus 5 had the highest relative bug rate in Rust code (1.73, 73% more counted bugs than the Rust average), statistically tied with Claude Fable 5.1.