Breaking down monthly AI agent costs: token math across six models

On October 3, 2026, an article published on DEV Community examined how to calculate the monthly token cost of an AI agent. Its central example: a single four-turn support conversation with a tool-using agent can send more than 45,000 input tokens to the model. That is roughly twelve times Anthropic's own estimate of about 3,700 tokens for a support conversation. According to the article, nothing is broken; each turn simply resends everything that came before it. That repeated resending of context is why most guides to AI agent cost per month hand readers wide ranges instead of a single number.

The article then lays out a formula for computing agent cost on a monthly basis and runs it through a small-business case, pricing the workload against six current models. The report does not name those six models, and it does not publish the individual per-model prices or the results of the calculation.

The story currently stops there. The piece offers a cost formula and a measurement approach, and uses the token volume of a four-turn conversation to illustrate the overhead created by resending context, but it stops short of sharing more complete figures from the exercise.