How good is Haiku?

I usually use sonnet 4.6 as my daily driver but I'm working on a big project now and considering haiku for it's token cost - Is it reliable?

Can haiku produce a 1,000 line script with no bugs like sonnets and Opus can?

Of course I could just try this but my context is in a sonnet chat and I don't think it would be a fair comparison until it had all the context