Below∅Day Joins the Anthropic's Red Team Network
Below∅Day Bringing Claude Mythos Offensive Security to Below∅Day & zer∅cipher.
Today, we're excited to announce that Below∅Day is joining Anthropic's restricted Red Team Access tier. Through it, we'll be working with Anthropic's most capable Claude models, including Claude Mythos, on authorized penetration testing and red team operations. This puts frontier AI built for offensive security in the hands of operators who already know how attackers think. It also powers the next generation of zer∅cipher, our continuous penetration testing platform.
Going Deeper in Red Teaming and Penetration Testing
Our operators will bring Claude into engagements where it adds real value: external and internal network testing, cloud, web application, mobile, wireless, social engineering, and AI and LLM penetration testing.
In a red team engagement, finding one vulnerability is rarely the story. The story is whether a misconfigured service, a captured hash, and a weak trust relationship chain into domain compromise. Frontier models help our operators explore more of those paths, faster, across code, configurations, permissions, and identities.
Our operators still validate every finding in the live environment, explain the business impact, and walk your team through the fix.
zer∅cipher: Continuous Penetration Testing, Now Powered by Darko + Mythos
An annual pen test is a snapshot. Attackers don't work on your audit calendar. zer∅cipher, built by Below∅Day, is our AI-native continuous penetration testing platform, and it just got a major upgrade.
Darko, zer∅cipher's decision engine, now pairs with Claude Mythos, Anthropic's most restricted and offensive cyber security model. Darko brings the attack knowledge, the evidence, the guardrails, and years of Below∅Day tradecraft. Mythos brings frontier-level reasoning. Together they read every result, weigh which path matters most, and pivot the way a skilled attacker would, around the clock and inside the scope you set.
The result: deeper attack chains, fewer dead ends, and proven risk on a continuous basis instead of once a year.
What zer∅cipher delivers:
- The Loop: Discover, Validate, Fix, Assure. Exposure is mapped continuously, attack paths are proven, fixes are supported, and retesting confirms the risk is actually closed.
- Internal and Active Directory depth. From recon to credential capture, lateral movement, privilege escalation, and domain compromise, with evidence at every step.
- Proof your team can act on. Managers see impact and priority. Remediators get affected assets, technical evidence, host-specific corrective guidance, and retesting.
- Your controls, always. Guided mode waits for your approval; Autopilot runs only inside your configured policy. A per-engagement risk ceiling and a real kill switch stop the work, not just the screen.
- Prohibited by design. No password changes, destructive deletion, reboots, availability disruption, persistence, or security-control tampering.
- Deploy your way. zer∅cipher SaaS, client-hosted, MSSP-managed, or fully air-gapped.
zer∅cipher for MSSPs and Partners
Managed security providers can now extend a penetration testing practice without flattening its quality. zer∅cipher for MSSPs gives partners a repeatable engagement engine powered by Darko + Mythos, with every client kept separate.
- One Partner HQ, separate client boundaries. Partner HQ is the control plane your team uses to run fleet operations across all of your clients. Each client gets its own Brain, a dedicated deployment that holds that client's engagement state, evidence store, and its own instance of Darko. Inside each client network, Pinkys do the hands-on work: lightweight execution agents placed in approved network segments. Each Pinky reports which networks it can reach, never bridges VLANs, and only picks up approved engagement work. No client's data ever touches another's.
- Standardize the discipline, not the outcome. Engagement templates, risk policy, approval boundaries, and review workflows make delivery repeatable while respecting each client's network.
- Review before delivery. Your team gets operational detail, customer-ready findings, remediation guidance, and report review before anything reaches the client.
- Scoped honestly. Client volume, hosting, packaging, and branding are built out in a working session with our team, not sold as an unlimited promise.
Start a partner working session
Top Talent, Frontier Models: Our Hackers Drive the Work
Below∅Day was built on raw talent, and that isn't changing. Not every engagement needs AI, and many of our best findings still come from an experienced operator who noticed something no tool would. Our people bring the creativity, judgment, and adversary mindset that no model replaces.
What changes is what our best people can do when they choose to bring frontier models in. We are doubling down on hiring and growing top offensive talent, then giving them the most capable models available. The model widens the search and speeds up the grind. The operator decides where to aim it, what to trust, and what it means for the client.
Our hackers set the scope, approve high risk actions, validate results in the live environment, and own every recommendation. No finding leaves Below∅Day without a hacker standing behind it. That is how we deliver top quality work, faster and deeper than people or models could alone.
Ready to See What an Attacker Would Find?
The goal hasn't changed: show you what actually matters in your environment and help you fix it. Now we can go deeper, get to the evidence faster, and keep testing long after the report is delivered.
Whether you need a red team engagement, continuous penetration testing with zer∅cipher, or a partner model for your MSSP, our team is ready.
