LLM Token Logging: Measure Usage, Latency, and Cost
Build an interpretable record of LLM usage, timing, retries, and cost estimates while preserving incomplete accounting states.
THE SIGNAL / TOPIC THREAD
Token usage.
A thread worth following.
Understand what an LLM usage total represents, where it came from, and how it relates to the request that triggered it.
A useful reading path
Start with the measurement guide below, then use the Token and LLM topic pages for field selection. Keep estimates separate from provider-reported usage, preserve attempt boundaries, and avoid treating missing usage as zero.