I gave Sonnet 5 (high effort) a pdf version of Thiruppavai and asked it to build an app (and then a single page html file) with the original tamil lyrics, transliteration and translation of the poems. This was a multi-turn effort and one that Opus 4.6 and GPT 5.2 had struggled to do some months ago specifically around language rendering for the web. I was really impressed in how Sonnet was able to tackle that fairly quickly so I could focus on the design and delivery of the experience.