We stress-tested AI spend limits under bursts and outages

The authors tested LiteLLM v1.106.6 and Revenium Python SDK 0.12.0 in October 2026 with a $0.05 per-customer budget on gpt-4o-mini, finding that a well-configured LiteLLM held budgets to within about 2.5% even through a database outage, while several of its safest behaviors are off by default. Revenium's accounting matched the authors' tally to within $0.00004, but its enforcement works from a copy of rules refreshed on a timer, so overshoot grew with spending rate and reached 117% at the 60-second default refresh. The piece lists recommended settings for both tools and notes Revenium fixed an enforcement URL issue in SDK 0.12.1, released October 31, 2026.