# Lenz

> Multi-model AI-powered claim verification platform that researches claims across multiple independent sources and score truthfulness on a scale of 1–10.

Lenz is a claim verification tool that uses AI to verify claims and rate their truthfulness. Users submit any claim — something they heard, read, or saw online — and receive a structured verification report. The pipeline uses AI to frame the claim, research it across the web, stage a debate between models arguing each side, then convene a panel of three adjudicators who evaluate source reliability, logical consistency, and claim precision. Each source is graded for authority. The result is a conclusion label (True, Mostly True, Mixed, Mostly False, or False) and a Lenz Score from 1 to 10. All verified claims are published in a public Library at https://lenz.io/library.

## How It Works

- [About Lenz](https://lenz.io/about): The company — what Lenz is and who it fact-checks AI output for
- [How It Works](https://lenz.io/how-it-works): Five-step verification pipeline from claim framing to conclusion

## Research

- [Beyond Benchmarks: Disagreement Among Frontier LLMs on Real-World Fact-Checks](https://lenz.io/research/llm-disagreement): 5 frontier LLMs vs ~1000 real user claims. Frozen v1.0 snapshot, full methodology, breakdowns, and CSV. Citable archival URL: https://lenz.io/research/llm-disagreement/v1.0

## Verified Claims

- [BA crew smuggling case: £2.4m scheme confirmed](https://lenz.io/c/aisha-mensah-clark-heathrow-cash-smuggling-444524a2): Mostly True — 7/10
- [Acecook Vietnam holds 40% instant noodle market share](https://lenz.io/c/acecook-vietnam-instant-noodle-market-leader-a1d78de7): Mostly True — 8/10
- [AI coding tools yield mixed productivity gains](https://lenz.io/c/ai-coding-tools-developer-productivity-2026-2d95fb47): Mixed — 5/10
- [Iran never demanded Obama-only talks—White House records](https://lenz.io/c/iran-negotiation-policy-barack-obama-only-b8d5d840): False — 2/10
- [1956 Bombay never required walking permits](https://lenz.io/c/municipal-corporation-greater-bombay-walking-permit-1956-5c1ae117): False — 2/10
- [Rumen Radev: Russia-friendly rhetoric, not pro-Russian](https://lenz.io/c/rumen-radev-pro-russian-political-leader-104e1106): Mixed — 5/10
- [Moore's Law slows but continues past 2026](https://lenz.io/c/moores-law-end-2026-3fbe7cd3): Mixed — 5/10
- [Infinite sets need Countable Choice for subsets](https://lenz.io/c/infinite-set-countably-infinite-subset-4806f0ad): Mostly False — 4/10
- [Bill Gates didn't produce Brain Honey video](https://lenz.io/c/bill-gates-brain-honey-video-production-83dc135f): False — 2/10
- [Firm image isn't further production — SNA 2008](https://lenz.io/c/image-improvement-further-production-producer-good-economics-b10bc798): True — 9/10
- [ABC conjecture remains unproven — Quanta Magazine review](https://lenz.io/c/the-abc-conjecture-has-been-proven-as-of-february-2026-d2932075): False — 2/10
- [Australian Consumer Law sits in Schedule 2](https://lenz.io/c/australian-consumer-law-schedule-2-cca-2010-ab82e4a3): True — 10/10
- [Bulgaria's 0.6% rule only applies to seniority](https://lenz.io/c/bulgarian-labour-code-minimum-annual-salary-increase-bb2eb0fc): Mostly False — 4/10
- [O2 geometry stays linear — NIST and NIH](https://lenz.io/c/dioxygen-o2-molecular-geometry-bent-linear-cc57ebba): False — 1/10
- [Salinas theater wall void rescue led to arrest](https://lenz.io/c/man-rescued-arrested-movie-theatre-wall-void-a3d36275): Mostly True — 8/10
- [ACL consumer guarantees apply automatically — ACCC](https://lenz.io/c/australian-consumer-law-consumer-guarantees-apply-8463bc3d): Mostly True — 8/10
- [Startup jobs pay less than established firms](https://lenz.io/c/entrepreneurship-job-creation-wages-vs-wage-employment-b3da8137): False — 2/10
- [Bank of Russia gold sales settle in rubles](https://lenz.io/c/bank-of-russia-selling-gold-chinese-yuan-548f6d51): False — 2/10
- [Second countable spaces are Lindelöf](https://lenz.io/c/second-countable-space-lindelof-countable-subcover-39fab129): True — 9/10
- [Australian Consumer Law guarantees safe, durable goods](https://lenz.io/c/australian-consumer-law-consumer-goods-requirements-157d465c): True — 9/10
- [Roman mortar formula is well known — Nature](https://lenz.io/c/roman-empire-construction-mortar-formula-unknown-5ef61410): False — 2/10
- [Pop Art rose with consumer culture, post-Abstract Expression](https://lenz.io/c/pop-art-consumer-society-reaction-abstract-expressionism-7abd1e5c): Mostly True — 7/10
- [No verified migrant exodus from West Bengal](https://lenz.io/c/illegal-immigrants-leaving-west-bengal-2026-f8d6bd6f): False — 2/10
- [Coffee linked to lower CVD risk, not proven cause](https://lenz.io/c/coffee-consumption-cardiovascular-disease-risk-reduction-0419a3b9): Mixed — 5/10
- [Remote sensing boosts crop yields and efficiency](https://lenz.io/c/remote-sensing-improve-food-production-c6fb413e): True — 9/10
- [Venice Commission warns Peru reforms threaten courts](https://lenz.io/c/venice-commission-peru-judicial-reforms-independence-e5a16a15): True — 9/10
- [Taiwan's global internet stayed online in May 2026](https://lenz.io/c/taiwan-internet-connectivity-international-outage-2026-9e58eabf): False — 2/10
- [No evidence Aditya Birla was manhandled in Kolkata](https://lenz.io/c/aditya-birla-manhandled-kolkata-incident-cd243675): Mostly False — 3/10
- [Blind lioness survival story unverified by science](https://lenz.io/c/blind-lioness-survival-wild-5-years-b1a7a007): Mixed — 5/10
- [Birth certificates aren't million-dollar stock bonds](https://lenz.io/c/us-birth-certificate-bond-stock-market-national-debt-013ca97d): False — 1/10
- [1492 Spain expulsion feared economic losses](https://lenz.io/c/1492-jewish-expulsion-spain-economic-damage-contemporary-cf1afc87): Mostly True — 8/10
- [Muscle mass isn’t a clear driver of estrogen clearance](https://lenz.io/c/muscle-mass-estrogen-clearance-metabolism-33c4da59): Mixed — 5/10
- [O2 ball-and-stick bonds are straight — NIST](https://lenz.io/c/oxygen-gas-ball-stick-model-curved-bond-b156a0c5): Mostly False — 3/10
- [Ionic compound names alphabetize ions within groups](https://lenz.io/c/ionic-compound-naming-multiple-ions-alphabetical-4c084a8d): Mostly True — 7/10
- [China joined Arms Trade Treaty in 2020](https://lenz.io/c/china-state-party-arms-trade-treaty-2020-8a65af93): True — 10/10
- [Phosphorescence stores sunlight via defect electron traps](https://lenz.io/c/phosphorescence-electron-traps-lattice-defects-af72503e): Mostly True — 8/10
- [MBTI lacks scientific validity — APA and review confirm](https://lenz.io/c/myers-briggs-type-indicator-scientific-validity-09ef6197): Mostly True — 7/10
- [Aqueous ion colors are shorthand for hydrates](https://lenz.io/c/chemists-color-ion-aqueous-solution-shorthand-44279332): Mostly True — 8/10
- [USAID funding suspensions have caused deaths](https://lenz.io/c/usaid-funding-suspension-deaths-aid-dependent-populations-5769e6fd): True — 9/10
- [UV-Vis spectroscopy is common in pharma QC](https://lenz.io/c/uv-vis-spectroscopy-common-pharmaceutical-analysis-96cf98b1): True — 9/10
- [Pelican “Gus” cooler story lacks documentation](https://lenz.io/c/brown-pelican-gus-frank-oreilly-cooler-82bb3b66): Mixed — 5/10
- [AI aids cancer detection in clinical radiology](https://lenz.io/c/ai-clinical-practice-medical-imaging-diagnosis-37cff59e): True — 9/10
- [AI deepfakes not broadly banned — legal analysis consensus](https://lenz.io/c/regulations-ai-deepfakes-real-people-2026-d90e6b43): False — 2/10
- [Claudia Arias lacks UNC forensic researcher affiliation](https://lenz.io/c/claudia-arias-national-university-cordoba-affiliation-3b3eb2fe): False — 2/10
- [Newsom hearing-aid program funded over multiple budgets](https://lenz.io/c/gavin-newsom-23-million-hearing-aids-children-65d8dbd1): Mixed — 6/10
- [Trump said Iran strike was postponed by Gulf requests](https://lenz.io/c/trump-iran-attack-postponed-gulf-allies-d71fadc3): True — 9/10
- [Eurovision winners not jury-led — ESC Insight tally](https://lenz.io/c/eurovision-winner-jury-vote-vs-televote-frequency-37568ffa): Mostly False — 3/10
- [Cancel culture's free speech impact overstated](https://lenz.io/c/cancel-culture-free-speech-western-societies-0eca2dcb): Mixed — 5/10
- [India heatwave advisory hoax — BOOM, FACTLY confirm](https://lenz.io/c/civil-defence-india-heat-advisory-april-may-2026-b7048bc8): False — 1/10
- [Germany imposes no exit ban for men in 2026](https://lenz.io/c/germany-men-military-permission-leave-country-2026-c2c8bd9b): Mostly False — 3/10

## Use Cases

- [AI Fact Checker](https://lenz.io/fact-checker): Verify any claim, headline, or post. Get a 1–10 Lenz Score with cited sources.
- [AI Research Assistant](https://lenz.io/ai-for-research): Research any statement across independent sources. Sourced verdicts and citations for papers, journalism, and curious learners.
- [Fact-Checking Tool for Editors & Reviewers](https://lenz.io/fact-checking-tool): Professional fact-checking tool — sourced verdicts with citations and full evidence, in the browser Workbench or via API.

## Interactive

- [Trending](https://lenz.io/trending): Trending claim verifications
- [Pulse](https://lenz.io/pulse): Community engagement dashboard with recent activity and verification stats
- [Play](https://lenz.io/play): Interactive verification game to test your knowledge

## Developer

- [Developers](https://lenz.io/developers): Fact-checking API for AI- and human-written documents — four primitives (/extract, /assess, /verify, /ask) with Python and TypeScript SDKs
- [Plans & Pricing](https://lenz.io/plans): Self-serve plans from Free to Scale — per-tier /verify, /assess, and /ask quotas, monthly and annual billing
- [LLM Hallucination Detection](https://lenz.io/hallucination-detection): Detect hallucinations in model output — extract claims, verify each against real sources, sourced verdicts with citations
- [Verify AI Output](https://lenz.io/verify-ai-output): Fact-check AI-generated documents, memos, and content claim by claim before anyone relies on them
- [Automated Fact-Checking](https://lenz.io/automated-fact-checking): Fact-check content in the publishing pipeline — auto-approve or flag for human review based on your thresholds
- [MCP Server](https://lenz.io/mcp-server): Connect Lenz to Claude Desktop, Claude Code, Cursor, or any MCP client — fact-checking tools (assess, verify) over Streamable HTTP with your API key
- [Public API Documentation](https://lenz.io/api/v1/docs/): Read-only REST API for searching claims and retrieving full verification reports
- [OpenAPI Specification](https://lenz.io/api/v1/openapi.json): Machine-readable OpenAPI 3.0 schema for the public API

## Policies

- [Terms of Use](https://lenz.io/terms): Terms and conditions for using Lenz
- [Privacy Policy](https://lenz.io/privacy): How we collect, use, and protect personal information
- [Contact](https://lenz.io/contact): Get in touch with the Lenz team

## Optional

- [Claim Library](https://lenz.io/library): Browse all verified claims by domain, entity, or search
- [Finance Claims](https://lenz.io/library/finance): Finance claim verifications
- [General Claims](https://lenz.io/library/general): General claim verifications
- [Health Claims](https://lenz.io/library/health): Health claim verifications
- [History Claims](https://lenz.io/library/history): History claim verifications
- [Legal Claims](https://lenz.io/library/legal): Legal claim verifications
- [Politics Claims](https://lenz.io/library/politics): Politics claim verifications
- [Science Claims](https://lenz.io/library/science): Science claim verifications
- [Tech Claims](https://lenz.io/library/tech): Tech claim verifications