Which AI model writes the most bugs in Terraform?

As of Sep 30, 2026, Claude Sonnet 5 had the highest relative bug rate in Terraform code (1.81, 81% more counted bugs than the Terraform average), statistically tied with Claude Opus 5.

Updated Sep 30, 2026

Best AI model for Terraform code

As of Sep 30, 2026, GPT-5.6 Sol had the lowest relative bug rate in Terraform code (0.68, 32% fewer counted bugs than the Terraform average), statistically tied with Claude Opus 4.8, among 4 ranked models.

Models ranked by relative bug rate in Terraform code. Lower values are better.
Rank	Model	Rate
1= (statistically tied)	GPT-5.6 Sol	0.68
2= (statistically tied)	Claude Opus 4.8	1.04
3= (statistically tied)	Claude Opus 5	1.41
4= (statistically tied)	Claude Sonnet 5	1.81

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

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Questions and answers

Which AI model writes the most bugs in Terraform?: As of Sep 30, 2026, Claude Sonnet 5 had the highest relative bug rate in Terraform code (1.81, 81% more counted bugs than the Terraform average), statistically tied with Claude Opus 5.