Head to head · Checked against vendor sites, September 2026
Koi (Palo Alto Networks) vs Prompt Security (SentinelOne): AI agent security compared
The verdict
Koi scores higher overall on our weights (7.1 vs 6.6 out of 10). Koi scores higher on visibility and tool-call control; Prompt Security scores higher on maturity and breadth. They tie on policy, footprint and identity and audit. Neither publishes list prices.
Koi (Palo Alto Networks Cortex Agentic Endpoint Security)
Owner: Palo Alto Networks (acquisition completed 14 April 2026)
Best for Palo Alto Cortex customers
Prompt Security (SentinelOne)
Owner: SentinelOne (acquisition announced 5 August 2025)
Best for SentinelOne customers
How do Koi and Prompt Security compare on each criterion?
| Criterion | Weight | Koi | Prompt Security | Edge |
|---|---|---|---|---|
| Visibility | 22% | 9 | 7 | Koi |
Why these scoresKoi: Visibility into models, MCPs, extensions and packages on the endpoint, with risk scoring. Prompt Security: Inventories AI tools and code assistants, including shadow AI, and maps agents and MCP servers. | ||||
| Tool-call control | 20% | 7 | 6 | Koi |
Why these scoresKoi: Blocks unsafe AI application interactions and prevents prompt injections; tool-call level mechanics not published. Prompt Security: Governs what agents and MCP servers can do; per-tool-call enforcement is not detailed. | ||||
| Policy | 15% | 7 | 7 | Tie |
Why these scoresKoi: Out-of-the-box policies and one-click removal of insecure packages, extensions and AI tools. Prompt Security: Prevents prompt injection and data leakage for tools such as GitHub Copilot, Cursor and Claude Code. | ||||
| Identity and audit | 12% | 5 | 5 | Tie |
Why these scoresKoi: Agent vs human attribution not described on the pages we reviewed. Prompt Security: Agent vs human attribution not described on the pages we reviewed. | ||||
| Footprint | 13% | 6 | 6 | Tie |
Why these scoresKoi: Agent-based; offered as a Cortex XDR module and as a standalone offering. Prompt Security: Built into the SentinelOne Singularity Platform; the deployment method is not detailed. | ||||
| Breadth | 8% | 7 | 8 | Prompt Security |
Why these scoresKoi: Palo Alto Networks is integrating Koi with Prisma AIRS for wider AI coverage. Prompt Security: Employees, developers and homegrown AI apps from testing to runtime. | ||||
| Maturity | 10% | 7 | 8 | Prompt Security |
Why these scoresKoi: Acquisition completed 14 April 2026 by Palo Alto Networks; pricing not published. Prompt Security: Backed by SentinelOne, which announced the acquisition on 5 August 2025; pricing not published. | ||||
| Total | 100% | 7.1 | 6.6 | Koi |
How do they deploy, and what do they cost?
| Attribute | Koi | Prompt Security |
|---|---|---|
| Owner | Palo Alto Networks (acquisition completed 14 April 2026) | SentinelOne (acquisition announced 5 August 2025) |
| How it reaches devices | Cortex XDR module or standalone agent | Part of Singularity Platform; method not published |
| Deployment detail | Integrates with Cortex XDR as a module and is also available standalone as an agent-based deployment. If you run Cortex XDR, this is the lowest-friction path; if you run another EDR, expect a separate agent. | SentinelOne says Prompt Security deploys in minutes and is part of the Singularity Platform that protects endpoints, cloud, identity and data. The specific deployment method (browser extension, endpoint agent, IDE extension or proxy) is not detailed on the page we reviewed. |
| Pricing | Contact sales. Pricing is not published. | Contact sales. Pricing is not published. |
Source: Cortex Agentic Endpoint Security · Press release, 14 April 2026 · SentinelOne Prompt Security page · SentinelOne press release, 5 August 2025 · prompt.security · Reviewed Sep 2026
Which should you choose?
Choose Koi if
- Your priority matches our designation for Koi: best for Palo Alto Cortex customers.
- You need a fleet-wide inventory of AI agents, MCP servers, extensions and credentials on devices: Koi scores 9 to 7.
- You need to evaluate or stop individual tool calls before they run: Koi scores 7 to 6.
Choose Prompt Security if
- Your priority matches our designation for Prompt Security: best for SentinelOne customers.
- Vendor maturity, public documentation and backing weigh heavily in procurement: Prompt Security scores 8 to 7.
- Your agents also run in SaaS platforms, cloud workloads or apps you build: Prompt Security scores 8 to 7.
Frequently asked questions
Which is better, Koi (Palo Alto Networks) or Prompt Security (SentinelOne)?
Koi scores higher overall on our weights (7.1 vs 6.6 out of 10). Koi scores higher on visibility and tool-call control; Prompt Security scores higher on maturity and breadth. They tie on policy, footprint and identity and audit. Scores are editorial assessments from public vendor material, reviewed September 2026.
Do Koi (Palo Alto Networks) and Prompt Security (SentinelOne) publish prices?
No. Neither publishes list prices, so ask both for a quote.
Do Koi (Palo Alto Networks) or Prompt Security (SentinelOne) replace EDR?
No. The tools in this guide add control over AI agent actions and work alongside EDR. Koi: Cortex XDR module or standalone agent. Prompt Security: Part of Singularity Platform; method not published.
Related
Sources
- Cortex Agentic Endpoint Security · Reviewed Sep 2026
- Press release, 14 April 2026 · Reviewed Sep 2026
- SentinelOne Prompt Security page · Reviewed Sep 2026
- SentinelOne press release, 5 August 2025 · Reviewed Sep 2026
- prompt.security · Reviewed Sep 2026