Audit-grade fact-checking for AI-drafted text.

# pip install lenz-io
from lenz_io import Lenz

client = Lenz(api_key="lenz_...")
extracted = client.extract(text=model_output)
# identified_claims is empty when the text yields a
# single statement
claims = extracted.identified_claims or [extracted.claim]
r = client.assess(claims=claims)

# "Error" means not checked: never ship it as clean
for c in r.claims:
    if (
        c.verdict in ("False", "Mostly False", "Mixed", "Error")
        or c.confidence == "low"
    ):
        print("HOLD:", c.claim, c.verdict, c.confidence)
# HOLD: Python 3.12 runs about 20% faster … False high

// npm install lenz-io
import { Lenz } from "lenz-io";
const client = new Lenz({ apiKey: "lenz_..." });
const out = await client.extract({ text: modelOutput });
// identified_claims is empty when the text holds a single claim
const claims = out.identified_claims?.length
  ? out.identified_claims
  : [out.claim ?? ""];
const { claims: rows } = await client.assess({ claims });
// "Error" means not checked: never ship it as clean
const hold = ["False", "Mostly False", "Mixed", "Error"];
for (const c of rows) {
  const verdict = c.verdict ?? "Error";
  if (hold.includes(verdict) || c.confidence === "low")
    console.log("HOLD:", c.claim, verdict, c.confidence);
}

curl -X POST https://lenz.io/api/v1/extract \
  -H "Authorization: Bearer $LENZ_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "text": "Python 3.12 runs about 20% faster than 3.11. ..."
  }'
# claims = identified_claims, or [claim] when
# identified_claims is []

curl -X POST https://lenz.io/api/v1/assess \
  -H "Authorization: Bearer $LENZ_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "claims": ["Python 3.12 runs about 20% faster than 3.11."]
  }'
# then hold the rows whose verdict or confidence fails your gate