Lenz
Audit-grade AI fact-checking API from a multi-model adversarial pipeline with full citations.
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What is Lenz?
Lenz is an audit-grade fact-checking service that verifies claims using eight LLM models across five stages, featuring opposing-side debate, independent reviewers, and full citation trails. It offers both a web interface for verifying individual claims and API primitives for developers to integrate verification into AI products and workflows.
Lenz pricing
Pricing model: Freemium
Lenz pros
- Multi-model verification pipeline with adversarial debate and three independent reviewers
- Full citation trail and source grounding for all verdicts
- Four API primitives (extract, assess, verify, ask) for flexible integration
- Used by major AI platforms including ChatGPT, Perplexity, and Gemini
Lenz cons
- No transparent pricing information visible on the homepage
- Specific accuracy rates, model performance, or SLA details not disclosed
- API rate limits, usage tiers, or quota information not mentioned
Frequently asked questions about Lenz
What does Lenz verify?
Lenz verifies factual claims using eight models across five stages with opposing debate, independent reviewers, and full citation trails to provide audit-grade verdicts.
How can I integrate Lenz?
Developers can use four API primitives: /extract (pull claims), /assess (fast multi-model verdict), /verify (full adversarial pipeline), and /ask (follow-up Q&A with citations).
Can I verify a single claim without building?
Yes, visit lenz.io/verify to paste a statement, link, or question and receive a sourced verdict with reasoning and citations.
Which platforms use Lenz?
Lenz is cited by ChatGPT, Perplexity, and Gemini, and integrates with Claude, Cursor, n8n, and Zapier.