Which AI model writes the most bugs in Svelte?

As of Sep 30, 2026, Claude Opus 5 had the highest relative bug rate in Svelte code (3.69, 269% more counted bugs than the Svelte average).

Updated Sep 30, 2026

Best AI model for Svelte code

As of Sep 30, 2026, Claude Opus 4.8 had the lowest relative bug rate in Svelte code (0.35, 65% fewer counted bugs than the Svelte average), statistically tied with GPT-5.6 Sol, among 3 ranked models.

Models ranked by relative bug rate in Svelte code. Lower values are better.
Rank	Model	Rate
1= (statistically tied)	Claude Opus 4.8	0.35
2= (statistically tied)	GPT-5.6 Sol	0.44
3	Claude Opus 5	3.69

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

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Questions and answers

Which AI model writes the most bugs in Svelte?: As of Sep 30, 2026, Claude Opus 5 had the highest relative bug rate in Svelte code (3.69, 269% more counted bugs than the Svelte average).