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Opinion / analysisAgents & Tool Use · MLOps, Tooling & Infrastructure · Business, Funding & Industry1 source · Oct 3, 2026

We're going to need default hard budget caps on pretty much everything

Here's a product feature which the world is going to need a whole lot more of over the coming months and years: default hard budget caps.

Key points

  • I'm talking about the feature of pay-by-usage services and APIs that lets you say "after $X/month, cut this thing off and return errors".
  • Soft caps, "after $X/month, send me a warning email", will not cut it.
  • I think hard budget caps need to be the default.
  • ... and it turns out AWS finally launched spending limits a few weeks ago!

Sources (1)

  • [1]We're going to need default hard budget caps on pretty much everything
    Simon Willison's Weblog · Oct 3, 11:34 PM
    Here's a product feature which the world is going to need a whole lot more of over the coming months and years: default hard budget caps.
    I'm talking about the feature of pay-by-usage services and APIs that lets you say "after $X/month, cut this thing off and return errors".

Extractive summary: sentences quoted from the sources.