Inference-cost audit

Most production LLM calls return a label, not prose — a route, a score, a yes/no, a category. Those calls pay for autoregressive generation they do not use. This audit finds them and prices the swap.

Deliverable: a ranked table of candidates with measured deltas. Sellable as a OneWave engagement; same shape as marketing-brain — a repeatable audit run per client.

1. Find the candidates

Search for LLM calls, then filter to the ones whose output is a label:

grep -rnE "messages\.create|chat\.completions|generateText|\.invoke\(|anthropic\.|openai\." \
  --include=*.{ts,tsx,js,py} . | grep -v node_modules

A call is a candidate when all of these hold:

• the prompt asks for one of a known, finite set of answers (≤255)
• the caller parses the response — JSON.parse, a regex, an enum lookup, .trim()
• nothing downstream shows a human the model's reasoning
• it runs often, or a user waits on it

Strong signals in the prompt text: "respond with only", "return JSON", "classify", "choose one of", "rate from 1 to", "answer yes or no", "do not explain".

Disqualifiers: the output is shown to a user, is used as content, needs a citation or justification, or the answer set is open-ended.

2. Measure what it costs today

Do not estimate. Instrument:

• calls/day — from logs or a counter, not a guess
• p50 and p95 latency — p95 is what users feel
• tokens in/out per call → current $/1k calls at the provider's list price
• is anything blocked on it — a user, a page render, an agent's next step

3. Price the swap

Benchmark against a labelled set from that call's real traffic (see jev-eval). Never project from a vendor benchmark.

Reference numbers, measured on real records, 4 questions per record:

	latency	cost/1k	accuracy
Jev hosted	399 ms	$0.023	matched Claude on a 15-record set
Von local	174 ms	$0.00	matched only with well-written criteria
Claude Haiku 4.5	2,322 ms	~$0.55	baseline

Jev pricing: $0.042/MTok input, output free.

4. Rank by payoff, not by ease

Rank each candidate on:

1. volume × unit saving — the actual dollar figure
2. is a human waiting — latency wins are worth more than cost wins on user-facing paths
3. blast radius if wrong — a misrouted support ticket is cheap; a mis-scored transaction is not
4. accuracy delta on the labelled set — anything below parity needs a confidence gate, and a gate has its own cost

Kill anything where volume is low. At a few hundred calls a day the savings round to zero and you have added a vendor.

5. Write it up

Per candidate: file and line, what it decides, calls/day, current latency and cost, projected latency and cost, measured accuracy delta, recommended gate, and a go / no-go with the reason.

Lead the summary with total projected monthly saving and the single biggest latency win.

Always include the limits: eval-set size, that Jev is early access with no SLA, and that a fallback to the existing call must stay wired.

Where this pays in the OneWave stack

• Sage widget routing — build it. A visitor is watching; 400 ms vs 2.3 s is the whole difference.
• RB2B visitor firehose — build it. The only stream with volume where 24x cheaper compounds.
• Lead intake classification — measure first. Correct, but a handful of leads a day.
• Lead watchdog — leave it. Nightly cron, nothing waits on it.

Related

jev-eval produces the accuracy numbers this audit depends on. jev-integrate is the wiring workflow for anything that gets a go.