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LLM vendors need to offer strict spending caps for API keys so that applications stop working the moment they hit a dollar threshold.

The author calls on LLM vendors to implement better spending controls, allowing users to set hard dollar caps that immediately stop API access. ✦ AI generated

Author · Simon Willison's Weblog · 2026-07-26 · original ↗

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LLM vendors really need to get better at offering strict caps for their API keys. I want my LLM apps to stop working the moment they hit a dollar threshold I've set for a period of time.

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supports → Because agent sessions can track cumulative dollar spend, users can cap a session's spending and require explicit approval before it spends more, preventing runaway costs.Matei Zaharia · Latent Space