AI agent cost calculator

An agent loops: each step re-sends the system prompt, the tools, and every prior step's output and tool result. That growing context is why a 20-step agent can cost far more than it looks. Size it here, and see how much prompt caching claws back.

How to use this

Describe one agent run: tokens in the fixed system and tools prompt, tokens added per step, output per step, and the number of steps. Because each step re-sends the growing context, watch how fast the total climbs. Apply it by capping steps, trimming tool output, and caching the fixed prefix.

Your agent

Model System + tools prompt (re-sent each step) 3,000 Tokens added per step (tool result + reasoning) 800 Output tokens per step 400 Steps per task 10 Tasks / month Prompt caching on (re-sent context cached)

Estimated cost

Per task (no cache)—

Per task (cached)—

Monthly—