Check AI-generated content before it ships or publishes.

# pip install lenz-io
from lenz_io import Lenz

client = Lenz(api_key="lenz_...")
extracted = client.extract(text=model_output)
# extract finds up to 100, most check-worthy first;
# one assess call takes 20, so this checks the first 20
claims = [c.claim for c in extracted.claims][:20]
rows = client.assess(claims=claims).claims if claims else []

# a failed row was not checked: never ship it as clean
bad = ("False", "Mostly False", "Mixed")
for c in rows:
    if c.status == "failed" or c.verdict in bad 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 });
// extract finds up to 100, most check-worthy first;
// one assess call takes 20, so this checks the first 20
const claims = (out.claims ?? []).map((c) => c.claim).slice(0, 20);
const rows = claims.length
  ? (await client.assess({ claims })).claims
  : [];
// a failed row was not checked: never ship it as clean
const bad = ["False", "Mostly False", "Mixed"];
for (const c of rows) {
  if (
    c.status === "failed" ||
    bad.includes(c.verdict ?? "") ||
    c.confidence === "low"
  )
    console.log("HOLD:", c.claim, c.verdict, c.confidence);
}

curl -X POST https://lenz.io/api/v1/extract \
  -H "Authorization: Bearer $LENZ_API_KEY" \
  -H "X-Lenz-API-Version: 2026-10-11" \
  -H "Content-Type: application/json" \
  -d '{"text": "Python 3.12 runs about 20% faster than 3.11. ..."}'
# send the "claim" of each item in "claims"

curl -X POST https://lenz.io/api/v1/assess \
  -H "Authorization: Bearer $LENZ_API_KEY" \
  -H "X-Lenz-API-Version: 2026-10-11" \
  -H "Content-Type: application/json" \
  -d '{"claims": ["Python 3.12 runs about 20% faster than 3.11."]}'
# hold a row whose status is "failed" (not checked),
# or whose verdict or confidence fails your gate