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

Blog · Watch/Read · (gathered 2026-10-05)

  • Simon Willison argues for “default hard budget caps” on pay-by-usage services and APIs, which should cut off service rather than just sending warnings, to prevent unexpected high bills from runaway code or agents.
  • He emphasizes that soft caps (warning emails) are insufficient, especially with the rise of coding and personal agents that reduce the friction of deploying cost-incurring services.
  • AWS recently launched “spending limits” (though currently limited availability) and Google Cloud introduced “Spend Caps” in July, indicating a positive trend towards this essential feature.
  • Users should prioritize services with hard budget caps, and providers should make these the default, requiring an explicit opt-in to remove them and accept responsibility for uncapped charges.