Prompt Security Platform

Prompt Security is a cybersecurity platform purpose-built to protect enterprises from the unique risks introduced by generative AI (GenAI) applications. Founded in 2023 and headquartered at 500 7th Avenue, New York, NY, the company targets organizations in healthcare, finance, and e-commerce that need to adopt AI tools — from employee-facing chatbots to customer-facing GenAI integrations — without exposing sensitive data or violating compliance mandates. In August 2025, Prompt Security was acquired by SentinelOne at a valuation between $250M and $300M, and it was named a 2025 SINET16 Innovator, signaling its recognition within the cybersecurity industry. The platform is designed for security teams, CISOs, and IT administrators who require visibility and control over the growing number of AI touchpoints in their organization, including third-party AI tools, homegrown GenAI applications, AI code assistants like GitHub Copilot, and agentic AI systems.

The platform operates by inspecting every prompt and model response in real time, blocking prompt injections, preventing data leaks of personally identifiable information (PII) or intellectual property, and filtering harmful or toxic content generated by large language models (LLMs). It offers four key modules: Prompt for Employees (visibility and governance for AI tool usage), Prompt for AI Code Assistants (secure adoption of AI coding tools), Prompt for Agentic AI (monitor and govern AI agents), and Prompt for Homegrown Applications (block prompt injections and data leaks in custom GenAI apps). A comprehensive dashboard provides a unified view of security status and alerts, while automated response systems can block or alert on detected breaches. The platform also includes an AI Red Teaming tool to identify vulnerabilities in homegrown AI applications, and it offers open-source tools like Prompt Fuzzer for vulnerability assessment. Integration with existing IT and security systems is designed to be straightforward, with onboarding described by customers as taking just minutes.

Prompt Security competes in the AI security and risk management market against a range of vendors including Lakera, Aim Security, SurePath AI, SonnyLabs.ai, and Unbound Security, as well as broader platforms like HikmaAI and Onyx Platform. According to 595 reference ratings on FeaturedCustomers, Prompt Security holds a 4.8 out of 5.0 rating, with 12 published testimonials and one case study (e.g., securing GenAI for long-term patient care at Elder Outreach). Customers such as New Relic (Senior Vice President Guy Fighel), Snapdocs (CISO Al Ghous), and Wix (Head of R&D Assaf Elovic) have publicly endorsed the platform for its simplicity and effectiveness. The company raised $23M in total funding before its acquisition, and its acquisition by SentinelOne positions it as a specialized component within a larger endpoint security portfolio, potentially offering deeper integration for SentinelOne customers.

Honest trade-offs include a learning curve for teams unfamiliar with GenAI-specific threats, as the platform’s settings and customization options require understanding of prompt injection, data leak vectors, and LLM behavior. The platform needs regular updates to keep pace with the rapidly evolving GenAI threat landscape, meaning security teams must commit to ongoing maintenance and patch cycles. Depending on the complexity of security protocols implemented — such as deep inspection of every prompt and response — the system may introduce minimal latency or processing overhead, which could affect real-time user experience in high-throughput environments. Additionally, pricing is not publicly disclosed (contact for pricing), which may complicate budget planning for smaller organizations or those without a dedicated procurement process. Finally, while the platform supports multiple industries, its effectiveness depends on proper configuration for each use case, and organizations with highly custom or niche AI workflows may need additional tuning.

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