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What does it really cost to run an AI agent?

By Ricardo Mulder. Published 23 August 2026. 7 minute read.

Short answer: the server is the small, predictable part and the model is the part that surprises people. Chat and scheduled routines on a cheap VPS with a cloud model land around 10 to 20 euro a month. Turn on browser automation and it becomes roughly 25 to 60 euro, almost all of it tokens. Run the model on hardware you already own and the token line disappears, leaving the server plus a few euro of electricity. The calculator below lets you put in your own numbers; every assumption is written out underneath it.

Your monthly cost

Change anything and the total updates. Nothing is sent anywhere.

Which agent?
How hard do you work it?
Where does the model run?
Which server?

Why the model, not the server, decides your bill

A VPS is a fixed line on your card: six euro at Contabo, seven at Hetzner, fourteen at Hostinger after the introductory term. You know that number a year in advance.

Tokens are not like that. Every time the agent decides something it reads a prompt, a list of tools, its memory and whatever the last step returned. A single "book me a table" is not one model call; it is a loop of read, decide, act, read again. Browser automation is the extreme case: every page the agent looks at becomes input tokens, and pages are long.

That is why two people on the same six-euro VPS can be twenty euro apart at the end of the month.

The three levers that actually move the number

  1. Use a cheaper model for the boring steps. Most of an agent's calls are routing, formatting and summarising, and a small model does those fine. Save the strong model for the step that needs judgement. This is the single biggest saving and it costs you almost nothing in quality.
  2. Cap what the agent feeds back. When it browses, it does not need the whole page. Trimming to the relevant part is the difference between a long task costing cents and costing euros.
  3. Move the model to hardware you own. Only worth it if the machine already exists. Buying a GPU to save on tokens takes years to pay back at personal-use volumes; see the 24-month comparison.

What is measured and what is modelled

Honesty matters more here than a confident number, so here is the split.

Measured, from provider pages and invoices: every server price in the calculator is the renewal price, checked on 23 August 2026 against the provider's own pricing page. Those are the same figures as in the comparison. Electricity is calculated at 0.18 euro per kWh, a European average; a machine idling most of the day at around 10 W costs about 1.30 euro a month.

Modelled, and therefore a range: token spend. The calculator uses three usage profiles built from our own invoices for personal use between January and August 2026, expressed as a rough number of model calls per day and an average size per call. Your mileage will differ, possibly by a lot, because it depends on which model you point it at and how disciplined you are about what the agent reads. Treat the token line as an order of magnitude, not a quote.

Not included: your time, domain names, and any paid API the agent itself calls. Backups are included at a flat two euro where the provider charges for them.

Questions people ask

How much does it cost to run OpenClaw per month?

For chat and scheduled routines on a cheap VPS with a cloud model, roughly 10 to 20 euro a month: about 6 to 7 for the server and the rest in tokens. With browser automation, roughly 25 to 60 euro, and the growth is almost entirely on the token side.

Is Hermes cheaper to run than OpenClaw?

Usually yes, for two reasons. It is happy on a smaller server, and its tasks tend to be narrower, so each one costs fewer tokens. The gap widens if you point it at a local model, which it was designed for.

Does a free tier really cost nothing?

Oracle's free tier costs nothing in money. It costs availability: capacity is often unavailable and idle instances can be reclaimed. Fine for a trial, wrong for something you rely on.

Why do you show renewal prices instead of the advertised ones?

Because the advertised price is not what you pay in month thirteen. Hostinger's headline needs a 24-month term and roughly doubles at renewal. Showing the intro price would make the cheapest option look like something it is not.

Sources

Server prices from provider pricing pages, 23 August 2026, cross-checked in our comparison. Electricity at 0.18 euro per kWh, European average. Token profiles derived from our own model invoices, January to August 2026, and rounded deliberately; they are a model, not a measurement of your setup.