Comment by JimDabell

Yes, Claude Opus 4.5 recently scored 100% on SvelteBench:

https://khromov.github.io/svelte-bench/benchmark-results-mer...

I found that LLMs sometimes get confused by Lit because they don’t understand the limitations of the shadow DOM. So they’ll do something like throw an event and try to catch it from a parent and treat it normally, not realising that the shadow DOM screws that all up, or they assume global / reset CSS will apply globally when you actually need to reapply it to every single component.

What I find interesting is all the platforms like Lovable etc. seem to be choosing Supabase, and LLMs are pretty terrible with that – constantly getting RLS wrong etc.