Top Prompt Security (SentinelOne) Alternatives for 2026
Prompt Security (SentinelOne) focuses on enterprise genai governance. Now part of SentinelOne, many teams evaluate alternatives for broader agent coverage, different deployment models, or pricing that fits their scale. Here are the top competitors to consider.
Category: Runtime Guardrails & AI Firewall • Last reviewed: 2026-07-03
What is Prompt Security (SentinelOne)?
Prompt Security was among the first full-lifecycle GenAI security platforms, protecting both employee AI usage (browser-level shadow AI controls) and homegrown LLM applications. SentinelOne acquired the company in September 2025 (reported ~$250M) and folded it into the Singularity platform, where it now provides prompt-injection defense, data-leak prevention, and shadow-AI visibility alongside SentinelOne's endpoint and cloud security telemetry.
Why teams look for Prompt Security (SentinelOne) alternatives
The product now lives inside a large EDR platform: buyers who are not SentinelOne customers face platform gravity, and the roadmap increasingly optimizes for Singularity integration. Teams needing deep agent-runtime controls — tool-call inspection, MCP governance — rather than employee-usage governance also tend to look at specialists.
GuardionAI
GuardionAI takes the "EDR for AI agents" idea further than an EDR vendor bolting on GenAI controls: it is agent-native, governing every command, tool call, and data access at the gateway with sub-130ms policy decisions, plus a Claude Code plugin for coding-agent governance on developer machines.
Why it's better than Prompt Security (SentinelOne)
sub-130ms guardrails latency • 96.3 F1 on the Prompt Security Leaderboard with 0.02% false positives • 50M+ agent actions protected per month
Lakera (Check Point)
A focused runtime security layer protecting against prompt injection, PII leakage, and hallucinations via API. Acquired by Check Point in late 2025 (~$300M reported); Lakera Guard and Lakera Red remain live products and anchor Check Point's Center of Excellence for AI Security.
- High performance / Low latency
- Vast threat intelligence database
Meta (Llama Guard)
A set of LLM safeguards designed to detect violating content across multiple use cases. Model-based guardrail.
Cisco AI Defense (Robust Intelligence)
Robust Intelligence pioneered the AI firewall and automated model assessment. Acquired by Cisco in 2024, its technology now ships as Cisco AI Defense — runtime protection, model validation, and AI visibility integrated with the Cisco security stack.
- Backed by Cisco infrastructure
- Automated red teaming
Prompt Security (SentinelOne) is a good fit for…
- •SentinelOne customers extending Singularity to GenAI usage
- •Enterprises prioritizing employee/shadow-AI governance
- •Security teams that want AI risk in the same console as endpoint telemetry
Look at alternatives if…
- •Non-SentinelOne shops wanting a standalone product
- •Agent-heavy stacks needing MCP-level enforcement
Our verdict
A strong option inside the SentinelOne ecosystem. Outside it, weigh independent agent-runtime platforms that were built for tool-call-level enforcement from day one.
Frequently asked questions
Is Prompt Security still available as a standalone product?
Following the September 2025 acquisition by SentinelOne (~$250M reported), Prompt Security's capabilities are delivered through the SentinelOne Singularity platform rather than as an independent offering.
What is Prompt Security (SentinelOne)?
Secures the entire lifecycle of Generative AI, protecting employees from risky AI use and developers from insecure model integrations. Acquired by SentinelOne in September 2025 (~$250M reported) and integrated into the Singularity platform for prompt injection, data leakage, and shadow AI protection. It is categorized under Runtime Guardrails & AI Firewall in the Guardion AI Security Index.
Who owns Prompt Security (SentinelOne)?
Prompt Security was acquired by SentinelOne. Acquired by SentinelOne in September 2025 (~$250M reported) and integrated into the Singularity platform for prompt injection, data leakage, and shadow AI protection.
Is Prompt Security (SentinelOne) open source?
No, Prompt Security (SentinelOne) is a commercial product (Subscription / Quote).
What are the best Prompt Security (SentinelOne) alternatives?
Teams evaluating Prompt Security (SentinelOne) most often compare it with Lakera (Check Point), Meta (Llama Guard), Cisco AI Defense (Robust Intelligence), and GuardionAI — all listed under Runtime Guardrails & AI Firewall.
How does Prompt Security (SentinelOne) compare to GuardionAI?
Prompt Security (SentinelOne) focuses on enterprise genai governance, while GuardionAI is an agent runtime governance platform ("EDR for AI agents") that governs every agent tool call inline with sub-130ms guardrails latency.
Last reviewed: 2026-07-03
Sources: prompt.security · sentinelone.com