# Sixtyfour

> Sixtyfour builds AI research agents that investigate people and companies.
> Given a single identifier — an email, name, phone number, company or domain —
> the agents browse the open web, official records and unstructured sources,
> then resolve what they find into one profile in which every claim is cited
> back to the source it came from.

Sixtyfour AI Inc. is a San Francisco company, backed by Y Combinator. The
product is used by trust and safety, risk, fraud, compliance and
investigations teams, and is available as a platform and as a research API.

Key facts:

- On its own published benchmark (RECON), Sixtyfour XHigh leads all 23 systems tested at 70.6% weighted accuracy.
- Findings are source-cited: every claim carries the record it came from.
- Coverage spans the open web, the dark web, official records and unstructured sources.
- SOC 2 compliant. Status at https://status.sixtyfour.ai
- Customers include Airwallex, Mercor, ZoomInfo, Cloaked, TRM Labs, Gryphon Investors, Delphi, Datacurve, Turing and GOTV.

## Product

- [Sixtyfour — the identity intelligence platform](https://www.sixtyfour.ai/): what the product does, who uses it, and the five use cases it is built for — research API, trust and safety, investigations, workforce identity, and financial crime.
- [Book a demo](https://www.sixtyfour.ai/demo): request a walkthrough.
- [API documentation](https://docs.sixtyfour.ai/introduction): endpoints, authentication and response shapes.

## Solutions

- [Trust and safety](https://www.sixtyfour.ai/solutions/trust-and-safety): screening sellers, hosts and merchants at onboarding and at volume, and detecting the rings operating behind them.
  - [Workforce identity](https://www.sixtyfour.ai/solutions/workforce-identity): Investigate candidate and contractor identities before the interview. Sixtyfour connects professional history, public records and cited evidence for review.
  - [Child Safety](https://www.sixtyfour.ai/solutions/child-safety): Support child safety investigations with source-cited identity research. Connect account identifiers, investigate aliases and review available age evidence.
- [Financial Institutions](https://www.sixtyfour.ai/solutions/financial-institutions): Investigate businesses, beneficial owners and adverse media with Sixtyfour. Source-cited intelligence for financial crime, KYB and enhanced due diligence.
- [Investigations](https://www.sixtyfour.ai/solutions/investigations): Turn a name, email or username into an investigation. Sixtyfour researches identities, connects records and surfaces source-cited findings for investigators.
- [Research API](https://www.sixtyfour.ai/solutions/research-api): Build people and company research into your product. Define the fields you need and use Sixtyfour’s API to return structured intelligence for your workflow.

## Research benchmark

- [RECON: A benchmark for researching individuals](https://www.sixtyfour.ai/recon-benchmark): HUD results on 514 human-verified fields for 140 people, updated October 10, 2026. Metrics are weighted accuracy, accuracy, precision and recall. Earlier p50 latencies are dated separately; they are not HUD timings.

RECON leaderboard, by weighted accuracy:

1. Sixtyfour XHigh (XHigh) — 70.6% weighted, 84.4% accuracy, 85.9% precision
2. Sixtyfour High (High) — 54.3% weighted, 67.7% accuracy, 83.5% precision, 459s earlier p50 (June 2026, not HUD)
3. Sixtyfour Scout (Scout) — 48.4% weighted, 66.3% accuracy, 78.8% precision
4. Sixtyfour Medium (Medium) — 44.7% weighted, 56.0% accuracy, 83.2% precision, 223s earlier p50 (June 2026, not HUD)
5. Parallel Ultra 2x (Parallel) — 41.1% weighted, 54.3% accuracy, 80.4% precision, 834s earlier p50 (June 2026, not HUD)
6. Parallel Ultra 8x (Parallel) — 37.5% weighted, 52.1% accuracy, 78.1% precision, 678s earlier p50 (June 2026, not HUD)
7. Grok 4.20 multi-agent (xAI) — 36.2% weighted, 51.6% accuracy, 77.0% precision
8. Grok 4.6 (xAI) — 36.0% weighted, 50.8% accuracy, 77.4% precision
9. Grok 4.3 (xAI) — 30.9% weighted, 44.9% accuracy, 76.2% precision
10. Sixtyfour Low (Low) — 28.8% weighted, 49.8% accuracy, 70.3% precision, 230s earlier p50 (June 2026, not HUD)
11. Parallel Ultra (Parallel) — 27.2% weighted, 43.4% accuracy, 72.9% precision, 589s earlier p50 (June 2026, not HUD)
12. Kimi K3 (max) (Moonshot) — 27.0% weighted, 36.0% accuracy, 80.1% precision
13. Claude Opus 5.5 (xhigh) (Anthropic) — 26.3% weighted, 32.9% accuracy, 83.3% precision
14. GPT-6 Astra (max) (OpenAI) — 25.1% weighted, 28.0% accuracy, 90.6% precision
15. Exa agent xhigh (Exa) — 23.9% weighted, 37.7% accuracy, 73.2% precision
16. GPT-6.1-sol max (OpenAI) — 23.0% weighted, 27.8% accuracy, 85.1% precision
17. GPT-5.6-sol xhigh (OpenAI) — 20.4% weighted, 31.3% accuracy, 74.2% precision
18. Gemini 3.1 Pro (high) (Google) — 13.4% weighted, 23.2% accuracy, 70.4% precision, 87s earlier p50 (June 2026, not HUD)
19. Claude Sonnet 5 (xhigh) (Anthropic) — 12.6% weighted, 20.0% accuracy, 73.0% precision
20. DeepSeek V4 Flash (high) (DeepSeek) — 12.5% weighted, 18.7% accuracy, 75.0% precision
21. DeepSeek V4 Pro (high) (DeepSeek) — 12.3% weighted, 18.9% accuracy, 74.0% precision
22. GLM 5.3 (max) (Z.AI) — 3.7% weighted, 13.8% accuracy, 57.7% precision
23. Claude Haiku 4.5 (Anthropic) — 1.6% weighted, 7.6% accuracy, 55.7% precision

## Writing

- [How to verify a vendor before you pay them](https://www.sixtyfour.ai/blog/how-to-verify-a-vendor): A real supplier can be impersonated and a fake one can look real. The checks that separate them, what each one proves, why a change of bank details is the moment to stop, and what to do if the money has already gone.
- [How to tell if a LinkedIn profile is fake](https://www.sixtyfour.ai/blog/how-to-tell-if-a-linkedin-profile-is-fake): A polished profile proves little. How to read a profile's age, badges, history and photo, look for the person outside LinkedIn, and weigh what each check is evidence of.
- [The new Sixtyfour search, tested on Exa's own benchmarks](https://www.sixtyfour.ai/blog/people-and-company-search-benchmark): Sixtyfour search now puts a match first on 90.4% of the queries in Exa's people search benchmark, ahead of every published result.
- [How to run an OSINT investigation](https://www.sixtyfour.ai/blog/how-to-run-an-osint-investigation): One case from the first question to the written report: how to scope it, pivot between identifiers, weigh each link, preserve the evidence and say how sure you are.
- [How to find out who owns a website](https://www.sixtyfour.ai/blog/how-to-find-out-who-owns-a-website): Most registration records now hide the owner. The pivots that still work, what each one is evidence of, and how to tell today's operator from a domain's earlier owners.
- [How to verify a resume: employment history, degrees and licences](https://www.sixtyfour.ai/blog/how-to-verify-a-resume): Job seekers stretch claims more often than they invent them. How to check each claim against a record the candidate did not write, and what a mismatch can mean.
- [Shell company red flags: how to check and weigh each one](https://www.sixtyfour.ai/blog/shell-company-red-flags): A crowded address or a busy director proves little on its own. What each red flag is evidence of, how to check it against a primary source, and what it means when several agree.
- [How to investigate a phone number](https://www.sixtyfour.ai/blog/how-to-investigate-a-phone-number): Reports often arrive with nothing but a phone number. What it can prove, how to date it, and why today's holder may not be the one you want.
- [Adverse media screening: how to review a hit](https://www.sixtyfour.ai/blog/adverse-media-screening): Many adverse media hits are about someone else, and many of the rest need context. How to resolve a hit, read what it alleges, and record the decision.
- [How to evaluate AI tools for investigations](https://www.sixtyfour.ai/blog/ai-tools-for-investigations): AI research agents can take on much of an investigation's legwork. Five checks tell you whether their results will hold up when someone asks how you know.
- [How to link related accounts in a trust and safety investigation](https://www.sixtyfour.ai/blog/how-to-link-related-accounts): Shared IPs, devices and cards connect accounts, and they also connect strangers. How to weigh each link, and when a cluster is really one operator.
- [KYB verification: checking a business is real, not just registered](https://www.sixtyfour.ai/blog/kyb-verification): A KYB check can confirm that a company was registered. The harder part is showing that it trades, who controls it, and that the bad news you found is about it.
- [How to detect synthetic identity fraud](https://www.sixtyfour.ai/blog/how-to-detect-synthetic-identity-fraud): A synthetic identity passes KYC because every piece of it checks out. What it usually lacks is the past a real person builds up without trying.
- [How to investigate an email address](https://www.sixtyfour.ai/blog/how-to-investigate-an-email-address): An email address is often the only identifier a report arrives with. Here is what it can tell you, the order to read it in, and where it misleads.
- [How to spot fake candidates before the interview](https://www.sixtyfour.ai/blog/how-to-spot-fake-candidates): Interviews test whether someone can do the job. A constructed identity usually can.
- [Best Exa alternatives for AI agents in 2026](https://www.sixtyfour.ai/blog/best-exa-alternatives): Eight alternatives compared across search, live fetching, browser automation, and cost at volume.
- [Inside Sixtyfour: how we operate](https://www.sixtyfour.ai/blog/how-we-operate): Twelve principles we actually run on — plus the 120lb flat cart that explains all of them.
- [Reverse username search: tracing one handle across platforms](https://www.sixtyfour.ai/blog/how-we-use-agents-for-reverse-username-search-investigations): Bad actors hide behind pixelated avatars and disposable handles. Here is how the chain unravels.
- [Identity resolution: catching banned users who rotate hardware](https://www.sixtyfour.ai/blog/how-we-use-agents-for-identity-resolution-on-banned-scammers): Device fingerprinting works on the bottom 90% of operators, but the top 10% rotate hardware before breakfast. Here is how to stop them.
- [How to detect rented gig-worker accounts](https://www.sixtyfour.ai/blog/how-we-use-agents-to-detect-rented-gig-worker-accounts): A $65 Facebook transaction is all it takes to put an unvetted stranger behind the wheel. Here's how Sixtyfour closes that gap.
- [Beneficial ownership: tracing who is behind a shell company](https://www.sixtyfour.ai/blog/how-we-trace-hidden-beneficial-owners-behind-shell-companies): In 2024, TD Bank pleaded guilty to $18.3 trillion in unmonitored transaction activity tied to money laundering. Here is how agents trace the beneficial owners behind shell networks.
- [Case study: how Mercor finds AI training experts](https://www.sixtyfour.ai/blog/case-study-how-mercor-uses-sixtyfour-to-find-ai-training-experts): How Sixtyfour helps Mercor find rare experts who can generate training problems current AI models cannot solve.
- [Case study: how Conduit unlocked the STR market](https://www.sixtyfour.ai/blog/case-study-how-conduit-unlocked-the-str-market-with-sixtyfour): How Sixtyfour helped Conduit identify fragmented short-term rental management companies that traditional data vendors could not reach.
- [Case study: how Whatnot found European TCG sellers](https://www.sixtyfour.ai/blog/case-study-how-whatnot-discovered-european-tcg-sellers-with-sixtyfour): How Sixtyfour helped Whatnot identify qualified TCG sellers across the UK, Netherlands, and France for live auction commerce.
- [Sixtyfour AI is now backed by Y Combinator](https://www.sixtyfour.ai/blog/sixtyfour-ai-is-now-backed-by-y-combinator): Sixtyfour AI is joining Y Combinator’s first-ever spring batch as we go all in on building the best AI research platform in the world.

## Brand and reference

- [Brand guidelines](https://www.sixtyfour.ai/brand): logos, colour, type and usage rules, published for external use.
- [Design tokens, W3C DTCG JSON](https://www.sixtyfour.ai/brand/tokens.json): the colour, type and radius scales as data.
- [Design tokens, CSS custom properties](https://www.sixtyfour.ai/brand/tokens.css).
- [Terms of service](https://www.sixtyfour.ai/legal/terms-of-service).
- [Privacy policy](https://compliance.sixtyfour.ai/en/documents/privacy).

## Optional

- [Blog index](https://www.sixtyfour.ai/blog): all posts, filterable by category.
- [RSS feed](https://www.sixtyfour.ai/rss.xml).
- [Sitemap](https://www.sixtyfour.ai/sitemap.xml).
- [Careers](https://www.ycombinator.com/companies/sixtyfour/jobs).
- [GitHub](https://github.com/sixtyfour-ai).
- [LinkedIn](https://www.linkedin.com/company/sixtyfourai).
- [X](https://x.com/sixtyfourai).