成本Cost
Cost
解决什么问题What problem it solves
为一个AI 方案实际要花多少钱。除了单价，还有你消耗掉的数量。What an AI approach actually costs. Beyond unit price there is also how much you consume.
这是什么What it is
把费用摊到一次任务上得到的真实开销。
构成：调用单价 × 实际消耗量（token 次数、时长、并发数）。
The real expense once costs are amortised across a task.
It comprises unit price times actual consumption (token count, duration, concurrency).
为什么需要知道Why it matters
按单价选模型容易出错——同样便宜，消耗量不同的模型总成本可能相反。Choosing a model on unit price alone is easy to get wrong — two models with identical prices can invert once real consumption differs.