Migrating a production AI agent to GPT-5.6: 2.2x faster, 27% cheaper

Thank you for a dense informative article with practical takeaways. This was an easy read and it reinforced the importance of some concepts in LLM based pipeline design.

> Ploy’s agent builds and edits real marketing websites. It plans a page, reads the codebase, writes components, generates imagery, screenshots its own work, and decides when it’s done. That job description sets a very high bar for a model, and we test every frontier release against it. For the four months Opus held the default slot (first Opus 4.7, then 4.8), nothing we tested beat it.

Well, unlike OP I haven't run a rigorous test, but I still would expect Fable to be significantly better at building marketing websites than Opus. It sure is way better at building decks.