HEAD TO HEAD
Koi (Palo Alto Networks) matched with Prompt Security (SentinelOne): agentic endpoint security compared
SHORT ANSWER
On our published weights Koi (Palo Alto Networks) scores higher overall, 5.75 to 5.45 out of 10. Koi scores higher on stop before it runs and capability rules; Prompt Security scores higher on public proof; they tie on verdict range, actor trail, rollout path, cloud and workspace reach and named agent coverage. Which fits depends on which of those criteria matters most to you.
By The Agent Desk · Agentic Endpoint Compare · Published 2026-10-11
Desk research from public vendor pages, press releases and standards pages read on 27 September and 11 October 2026. Editorial assessment; we did not run the products.
How do they compare at a glance?
Koi (Palo Alto Networks)
Palo Alto Networks (acquisition completed 14 April 2026)
Palo Alto Networks Cortex XDR estates
Rank 7 of 8 among broader AI security platforms
Prompt Security (SentinelOne)
SentinelOne (deal announced 5 August 2025; completion reported in September 2025)
SentinelOne Singularity estates
Rank 8 of 8 among broader AI security platforms
Which scores higher on each criterion?
| Criterion | Weight | Koi (Palo Alto Networks) | Prompt Security (SentinelOne) | Higher |
|---|---|---|---|---|
| Stop before it runs | 25% | 7 / 10 Stops malicious actions, blocks unsafe AI application interactions and prevents prompt injections; tool-call decision mechanics are not published. Source: Palo Alto Networks: Cortex Agentic Endpoint Security · Read 27 Sep 2026 | 6 / 10 Governs what agents and MCP servers can do; per-tool-call enforcement is not detailed. Source: SentinelOne: Prompt Security, securing AI · Read 27 Sep 2026 | Koi |
| Verdict range | 15% | 3 / 10 Documents 2 of six verdict types: Block or deny and Remove or scale back. "Stops malicious actions and offers one-click removal of insecure packages, extensions and AI tools." Source: Palo Alto Networks: Cortex Agentic Endpoint Security · Read 27 Sep 2026 | 3 / 10 Documents 2 of six verdict types: Block or deny and Mask or modify. "Prevents prompt injection and data leakage; its browser extension inspects and redacts prompts." Source: SentinelOne: Prompt Security, securing AI · Read 27 Sep 2026 Source: Prompt Security blog: browser and endpoint sensors (updated 16 August 2026) · Read 11 Oct 2026 | Tie |
| Capability rules | 15% | 6 / 10 Out-of-the-box policies, agent runtime custom policies and one-click removal of insecure packages, extensions and AI tools. Source: Palo Alto Networks blog: A Quarter of Innovation with Koi Agentic Endpoint Security (18 August 2026) · Read 11 Oct 2026 | 5 / 10 Maps agents and MCP servers and finds shadow MCP servers; capability rules are not itemized. Source: SentinelOne: Prompt Security, securing AI · Read 27 Sep 2026 | Koi |
| Actor trail | 10% | 5 / 10 Agent versus person attribution is not described on the pages we read. Source: Palo Alto Networks: Cortex Agentic Endpoint Security · Read 27 Sep 2026 | 5 / 10 Agent versus person attribution is not described on the pages we read. Source: SentinelOne: Prompt Security, securing AI · Read 27 Sep 2026 | Tie |
| Rollout path | 10% | 6 / 10 Agent-based: a Cortex XDR module or a standalone offering. Source: Palo Alto Networks press release: Koi acquisition completed (14 April 2026) · Read 27 Sep 2026 | 6 / 10 Two resident sensors, a browser extension and a dedicated AI endpoint agent, inside the SentinelOne Singularity Platform. Source: Prompt Security blog: browser and endpoint sensors (updated 16 August 2026) · Read 11 Oct 2026 | Tie |
| Cloud and workspace reach | 10% | 6 / 10 An endpoint product; Palo Alto Networks is integrating Koi with Prisma AIRS for wider AI coverage. Source: Palo Alto Networks press release: Koi acquisition completed (14 April 2026) · Read 27 Sep 2026 | 6 / 10 Covers homegrown AI apps from testing to runtime as well as employee and developer AI use. Source: SentinelOne: Prompt Security, securing AI · Read 27 Sep 2026 | Tie |
| Named agent coverage | 5% | 5 / 10 Names 3 of the six agents we track: Claude Code, Cursor and OpenAI Codex. Source: Palo Alto Networks blog: A Quarter of Innovation with Koi Agentic Endpoint Security (18 August 2026) · Read 11 Oct 2026 | 5 / 10 Names 3 of the six agents we track: Claude Code, Cursor and GitHub Copilot. Source: SentinelOne: Prompt Security, securing AI · Read 27 Sep 2026 | Tie |
| Public proof | 10% | 7 / 10 Acquisition by Palo Alto Networks completed 14 April 2026; pricing not published. Source: Palo Alto Networks press release: Koi acquisition completed (14 April 2026) · Read 27 Sep 2026 | 8 / 10 Backed by SentinelOne, which announced the acquisition on 5 August 2025; pricing not published. Source: SentinelOne press release: agreement to acquire Prompt Security (5 August 2025) · Read 27 Sep 2026 | Prompt Security |
Which verdicts does each document?
| Verdict type | Koi (Palo Alto Networks) | Prompt Security (SentinelOne) |
|---|---|---|
| Block or deny | Documented | Documented |
| Ask a person | Not described | Not described |
| Alert or warn | Not described | Not described |
| Mask or modify | Not described | Documented |
| Simulate first | Not described | Not described |
| Remove or scale back | Documented | Not described |
- Koi (Palo Alto Networks): "Stops malicious actions and offers one-click removal of insecure packages, extensions and AI tools."
Source: Palo Alto Networks: Cortex Agentic Endpoint Security · Read 27 Sep 2026
- Prompt Security (SentinelOne): "Prevents prompt injection and data leakage; its browser extension inspects and redacts prompts."
Source: SentinelOne: Prompt Security, securing AI · Read 27 Sep 2026
Source: Prompt Security blog: browser and endpoint sensors (updated 16 August 2026) · Read 11 Oct 2026
How does each reach devices?
Koi (Palo Alto Networks)
A Cortex XDR module, or a standalone agent-based offering.
Source: Palo Alto Networks press release: Koi acquisition completed (14 April 2026) · Read 27 Sep 2026
Prompt Security (SentinelOne)
Two local sensors, a browser extension and a dedicated AI endpoint agent, built into the SentinelOne Singularity Platform.
Source: Prompt Security blog: browser and endpoint sensors (updated 16 August 2026) · Read 11 Oct 2026
Which agents does each name?
| Agent | Koi (Palo Alto Networks) | Prompt Security (SentinelOne) |
|---|---|---|
| Claude Code | Named | Named |
| Cursor | Named | Named |
| GitHub Copilot | Not named | Named |
| OpenAI Codex | Named | Not named |
| Windsurf | Not named | Not named |
| Claude Desktop | Not named | Not named |
| Named | 3 of 6 | 3 of 6 |
Which should you choose?
Choose Koi (Palo Alto Networks) if you need stop before it runs and public proof. Koi (Palo Alto Networks) is best for: Palo Alto Networks Cortex XDR estates.
Choose Prompt Security (SentinelOne) if you need public proof and stop before it runs. Prompt Security (SentinelOne) is best for: SentinelOne Singularity estates.
Frequently asked questions
Which is better for agentic endpoint security, Koi (Palo Alto Networks) or Prompt Security (SentinelOne)?
On our published weights Koi (Palo Alto Networks) scores higher overall, 5.75 to 5.45 out of 10. See the criterion table above for where each scores higher.
Which stops an agent action before it runs more fully, Koi (Palo Alto Networks) or Prompt Security (SentinelOne)?
Koi (Palo Alto Networks) scores higher on stopping an action before it runs (7 to 6). Koi (Palo Alto Networks): Stops malicious actions, blocks unsafe AI application interactions and prevents prompt injections; tool-call decision mechanics are not published. Prompt Security (SentinelOne): Governs what agents and MCP servers can do; per-tool-call enforcement is not detailed.
Do Koi (Palo Alto Networks) and Prompt Security (SentinelOne) publish prices?
Koi (Palo Alto Networks): not published. Palo Alto Networks publishes no pricing for Cortex Agentic Endpoint Security. Prompt Security (SentinelOne): not published. SentinelOne publishes no pricing for Prompt Security.