Total cost of ownership
The 25 Per Cent Bill
Direct answer
The 25 Per Cent Bill is a ByteCosts research deep-dive on total cost of ownership. Finance approves the build. The build is barely a quarter of what a production agent costs over three years. The rest hides in the run-and-maintain horizon - and it is where most AI business cases quietly fall apart. This page is the finance-readable summary: it explains the cost mechanic behind the headline, links to the interactive data story, and points to the calculators that model the same numbers on your own workload. Read it before you size a budget, pick a model, cloud, or subscription, or defend a pricing decision, because the headline number is rarely the number you actually pay. The summary, key points, related tools, and citation are all in the static HTML before JavaScript runs.
Open the interactive data story - 10 min read →
Summary
Finance approves the build. The build is barely a quarter of what a production agent costs over three years. The rest hides in the run-and-maintain horizon - and it is where most AI business cases quietly fall apart.
This ByteCosts research note turns the pattern above into budgeting questions and shows where the real cost lands, so total cost of ownership stops being a surprise on the invoice.
What "The 25 Per Cent Bill" covers
- The practical cost pattern behind the headline figure
- Why the number on the pricing page is rarely the number you pay
- The budget risk to watch for, and the lever that moves it most
- How to model the same scenario with your own usage in ByteCosts
Use it with the ByteCosts calculators
Open the interactive story for the full walkthrough, then bring the pattern back to a calculator and replace the example assumptions with your own users, requests, tokens, seats, or platform usage.
The goal is to convert the article's cost pattern into a concrete monthly run-rate, per-user margin, or break-even point your team can actually discuss.
Frequently asked questions
Is this research readable before JavaScript runs?
Yes. The summary, direct answer, key points, related tools, and citation block are in the prerendered HTML. The interactive scrollytelling version is a separate linked page.
Can I model this scenario with my own numbers?
Yes. Use the linked ByteCosts calculators to replace the article's example assumptions with your own workload, usage, and pricing.
Cite this page
The 25 Per Cent Bill. ByteCosts. Updated Jun 2026. https://bytecosts.com/research/the-25-percent-bill/