Frontier models are what you reach for when quality matters more than cost: writing the actual code, producing the final user-facing answer, planning a complex task. They are typically 10× to 30× more expensive per token than the same provider's fast tier. Routing them to the right turns is the cost trick.
Engineering notes from the Digitorn team. No marketing, no launch announcements, no "10 prompts that will change your life". Just the things we write that we'd want to read.