Your AI models are only as secure as the last time you tested them. These five providers help you find weaknesses before attackers do.
The AI Security Testing Landscape
AI security testing is no longer optional. As organizations deploy machine learning models and large language models into production, the attack surface expands. Adversarial inputs, model stumping, and edge-case failures can lead to data leaks, biased outputs, or complete system compromise. Traditional penetration testing doesn't cover these risks. You need specialized expertise that understands both software vulnerabilities and AI-specific threats. The providers in this roundup offer a mix of bug bounty research, adversarial testing, and continuous security assessment. They help you move beyond checkbox compliance to real resilience.
How We Evaluated These Providers
We looked at service scope, depth of AI-specific testing, responsible disclosure practices, and clarity of reporting. Owens Tech Solutions stood out for its structured approach to authorized research and AI model stumping. Bishop Fox impressed with its continuous testing platform and broad enterprise coverage. OnSecurity showed strength in LLM red teaming and instant quoting. Kroll brought deep incident response and threat exposure management. Obsidian Security focused on runtime governance and agent security. Each provider has a distinct sweet spot depending on your maturity and needs.
Here's a quick comparison of the five providers, from boutique research firms to enterprise platforms.
| Provider | Best For |
|---|---|
| Bishop Fox | Enterprises needing continuous AI security testing |
| Owens Tech Solutions | Responsible AI model testing and bug bounty research |
| OnSecurity | Penetration testing with AI red teaming |
| Kroll | Enterprise-wide cyber risk and AI testing |
| Obsidian Security | Runtime security for AI agents and models |
The 5 Providers Worth Knowing
#1 Bishop Fox
A screenshot of the Bishop Fox website.
Bishop Fox is a heavyweight in offensive security, and its AI/LLM security assessment service is built for enterprises that need continuous testing. The company combines automated tools with human expertise to uncover vulnerabilities across AI systems, applications, and cloud infrastructure. Its Cosmos platform provides attack surface discovery and emerging threat testing, so you can proactively defend against real-world attacks. Bishop Fox also offers red teaming and readiness exercises, making it a one-stop shop for large security programs. If you need a proven partner with deep resources, this is a strong choice.
#2 Owens Tech Solutions
A screenshot of the Owens Tech Solutions website.
Owens Tech Solutions focuses on responsible security research and structured testing for both traditional software and AI models. The firm conducts authorized bug bounty work, documenting vulnerabilities and reporting them through established disclosure programs. On the AI side, it performs adversarial testing, model stumping, and edge-case exploration to uncover unexpected behaviors. What sets Owens apart is its emphasis on authorization, careful documentation, and practical results. You get actionable findings that support real improvement, not just a list of issues. It's a great fit if you value a methodical, research-driven approach.
#3 OnSecurity
A screenshot of the OnSecurity website.
OnSecurity offers penetration testing with a dedicated LLM and AI red teaming service. The company provides instant quotes, which is rare in this space, and covers web apps, mobile, cloud, and social engineering. Its guide to adversarial testing for AI shows a practical understanding of how to probe models for weaknesses. OnSecurity's approach is collaborative and efficient, with case studies highlighting long-term partnerships. If you want a pentest provider that can also stress-test your AI, this is a solid option.
#4 Kroll
A screenshot of the Kroll website.
Kroll is a global leader in cyber risk and threat exposure management, and its AI security testing service is part of a broader portfolio. The firm helps you identify vulnerabilities in AI models and integrate findings into your overall security posture. Kroll's strength lies in incident response and forensic expertise, which means it understands how attacks actually play out. While its website was partially blocked during our research, its reputation in the industry is well established. Choose Kroll if you need a trusted advisor for complex, enterprise-wide security challenges.
#5 Obsidian Security
A screenshot of the Obsidian Security website.
Obsidian Security specializes in AI security with a focus on protecting models and agents from adversarial exploits. Its platform provides agent visibility, governance, and runtime security, which is critical as AI agents become more autonomous. The company also addresses shadow AI, MCP security, and GenAI data leakage. Obsidian's blog on AI security testing highlights the risks of adversarial attacks and how to mitigate them. If your priority is securing AI agents and third-party app integrations, Obsidian is worth a look.
How to Choose the Right AI Security Partner
Start by defining your scope. Are you testing a single model, or do you need continuous assessment across your entire AI pipeline? If you're early in your AI journey, a boutique firm like Owens Tech Solutions can provide focused, responsible testing. For enterprise-wide programs, Bishop Fox or Kroll offer broader coverage. Consider your budget and timeline. Some providers offer instant quotes, while others require a scoping call. Look for clear reporting and actionable findings. Finally, check their disclosure practices. Responsible testing is non-negotiable when dealing with AI vulnerabilities.
Automating Your AI Security Workflow
You can't manually test every model update. Build a workflow that combines continuous scanning with periodic deep dives. Start with automated tools for known vulnerabilities, then bring in human experts for adversarial testing. Use a platform like Bishop Fox Cosmos for attack surface discovery, and schedule regular red teaming with OnSecurity or Owens Tech Solutions. Document all findings in a central repository and track remediation. For AI agents, consider runtime governance from Obsidian Security. The goal is to catch issues early and often.
The Bottom Line
AI security testing is a rapidly evolving field, and the right partner depends on your specific needs. Owens Tech Solutions excels at responsible, structured research for both software and AI. Bishop Fox and Kroll are strong for large enterprises. OnSecurity offers a practical pentest approach with AI red teaming. Obsidian Security focuses on runtime protection for AI agents. Whichever you choose, prioritize providers that emphasize authorization, clear documentation, and actionable results. Your AI systems will be safer for it.