Which AI model writes the most bugs in Rust?

As of Nov 14, 2026, Claude Fable 5.1 had the highest relative bug rate in Rust code (1.34, 34% more counted bugs than the Rust average), statistically tied with Claude Opus 5.5.

Updated Nov 14, 2026

Best AI model for Rust code

As of Nov 14, 2026, GPT-6.1 Sol had the lowest relative bug rate in Rust code (0.33, 67% fewer counted bugs than the Rust average), statistically tied with GPT-6 Astra, among 4 ranked models.

Models ranked by relative bug rate in Rust code. Lower values are better.
Rank	Model	Rate
1= (statistically tied)	GPT-6.1 Sol	0.33
2= (statistically tied)	GPT-6 Astra	0.36
3= (statistically tied)	Claude Opus 5.5	1.19
4= (statistically tied)	Claude Fable 5.1	1.34

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 Nov 14, 2026, Claude Fable 5.1 had the highest relative bug rate in Rust code (1.34, 34% more counted bugs than the Rust average), statistically tied with Claude Opus 5.5.