Model tiers

Providers sell a ladder of models at very different prices. Higher rungs cost more per token, tend to be slower and tend to do better on hard work. The names change often, so check the current list rather than remembering one.

Using the top rung to rename a variable is waste, and the cheapest rung on a hard task can cost more in retries than getting it right once. Judge a tier by its cost per finished task, on your tasks.