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Series 9 parts

The Real Cost of AI

What coding agents cost once retries, review, caching and quotas are counted: nine parts from a $214 bill to measuring your own usage, with prices read on September 30, 2026.

Related: AI FinOps for coding agents: cost regimes, levers and a dated market snapshot.

  1. 1

    A $214 AI coding agent rewrite

    A verified $214 bill for a production rewrite, checked against the source transcript, sits beside a corpus of about 2,900 tech talks on coding-agent costs.

    Article ·
  2. 2

    Why AI ROI stays invisible, even to the people measuring it

    Claims that nobody can measure AI ROI and that 95% of pilots return zero are weaker than their usual retellings, once their sources are checked.

    Article ·
  3. 3

    AI coding productivity at scale: 15-20% measured, 20x in one team

    Stanford measures a 15-20% coding gain after rework. Stripe's reported 1,300 weekly pull requests show a different productivity signal.

    Article ·
  4. 4

    FinOps applied to tokens: who owns the AI bill

    Cloud FinOps put a cost study first and a named owner for the number second. Three practitioner cases show that sequence applied to token bills.

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  5. 5

    The price-per-token lie: why cheaper models don't mean cheaper bills

    Opus 5.5 changes input, output and cache economics. Price the accepted task, including retries and review, before choosing a cheaper model.

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  6. 6

    You cannot depend on a single AI vendor

    A $589 billion single-day stock rout, an enterprise model platform, and a €25,000 backup server show three scales of vendor dependence.

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  7. 7

    Doctolib's cross-verified AI adoption data

    Four conference talks and outside sources document Doctolib's AI adoption from 30 engineers to 600, without reducing it to one figure.

    Article ·
  8. 8

    The trillion-dollar backdrop: what markets see that teams don't

    One gigawatt of AI data-center capacity costs about $50 billion. OpenAI has discussed adding up to 26, behind the series' cost figures.

    Article ·
  9. 9

    Measuring your own AI usage: three meters, three different answers

    Twenty days of my own Claude Code and Codex usage, measured three ways. The tools disagree by a factor of three, and dollars are not what binds.

    Article ·
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