Head to head · Checked against vendor sites, September 2026
Ent vs Prompt Security (SentinelOne): AI agent security compared
The verdict
Ent scores higher overall on our weights (6.7 vs 6.6 out of 10). Ent scores higher on tool-call control, policy and identity and audit; Prompt Security scores higher on maturity and breadth. They tie on visibility and footprint. Neither publishes list prices.
Prompt Security (SentinelOne)
Owner: SentinelOne (acquisition announced 5 August 2025)
Best for SentinelOne customers
How do Ent and Prompt Security compare on each criterion?
| Criterion | Weight | Ent | Prompt Security | Edge |
|---|---|---|---|---|
| Visibility | 22% | 7 | 7 | Tie |
Why these scoresEnt: A live view of OpenAI Codex, Claude Code, Claude Cowork, GitHub Copilot, Cursor and other AI tools and agents; MCP server and credential inventory is not itemized. Prompt Security: Inventories AI tools and code assistants, including shadow AI, and maps agents and MCP servers. | ||||
| Tool-call control | 20% | 7 | 6 | Ent |
Why these scoresEnt: Steps in at the moment of risk and blocks risky agent behavior; per-tool-call mechanics are not described on the pages we read. Prompt Security: Governs what agents and MCP servers can do; per-tool-call enforcement is not detailed. | ||||
| Policy | 15% | 8 | 7 | Ent |
Why these scoresEnt: One programmable, intent-aware policy for people and AI agents, with responses from a soft nudge to a hard block, and app control that can allow, block, deny or restrict usage; an on-device small language model classifies sensitive data. Prompt Security: Prevents prompt injection and data leakage for tools such as GitHub Copilot, Cursor and Claude Code. | ||||
| Identity and audit | 12% | 7 | 5 | Ent |
Why these scoresEnt: Applies the same policy to people and agents and builds investigation timelines annotated in plain language as events happen. Prompt Security: Agent vs human attribution not described on the pages we reviewed. | ||||
| Footprint | 13% | 6 | 6 | Tie |
Why these scoresEnt: A single lightweight agent across Windows, macOS, Linux and modern browsers, as SaaS or self-hosted in your own cloud; rollout through MDM is not stated. Prompt Security: Built into the SentinelOne Singularity Platform; the deployment method is not detailed. | ||||
| Breadth | 8% | 6 | 8 | Prompt Security |
Why these scoresEnt: Endpoint and browser coverage for insider risk, last-mile threats such as ClickFix, AI usage control and data security; SaaS agents and cloud workloads are not described. Prompt Security: Employees, developers and homegrown AI apps from testing to runtime. | ||||
| Maturity | 10% | 5 | 8 | Prompt Security |
Why these scoresEnt: Came out of stealth on 16 June 2026 with a $100 million seed led by Decibel; founders co-founded RiskIQ; no documentation portal or pricing on ent.ai. Prompt Security: Backed by SentinelOne, which announced the acquisition on 5 August 2025; pricing not published. | ||||
| Total | 100% | 6.7 | 6.6 | Ent |
How do they deploy, and what do they cost?
| Attribute | Ent | Prompt Security |
|---|---|---|
| Owner | Not acquired | SentinelOne (acquisition announced 5 August 2025) |
| How it reaches devices | Single lightweight agent; SaaS or self-hosted | Part of Singularity Platform; method not published |
| Deployment detail | A single lightweight agent across Windows, macOS, Linux and modern browsers, as SaaS or self-hosted in your own cloud. Rollout through MDM is not stated. | 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. Ent does not publish pricing. | Contact sales. Pricing is not published. |
Source: ent.ai · Ent press: intent-aware prevention (30 Jul 2026) · Ent press: $100M seed (16 Jun 2026) · Ent company · SentinelOne Prompt Security page · SentinelOne press release, 5 August 2025 · prompt.security · Reviewed Sep 2026
Which should you choose?
Choose Ent if
- Your priority matches our designation for Ent: best for one intent-aware policy across people and agents.
- You need an audit record that separates agent actions from human actions: Ent scores 7 to 5.
- You need to evaluate or stop individual tool calls before they run: Ent 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 5.
- Your agents also run in SaaS platforms, cloud workloads or apps you build: Prompt Security scores 8 to 6.
Frequently asked questions
Which is better, Ent or Prompt Security (SentinelOne)?
Ent scores higher overall on our weights (6.7 vs 6.6 out of 10). Ent scores higher on tool-call control, policy and identity and audit; Prompt Security scores higher on maturity and breadth. They tie on visibility and footprint. Scores are editorial assessments from public vendor material, reviewed September 2026.
Do Ent and Prompt Security (SentinelOne) publish prices?
No. Neither publishes list prices, so ask both for a quote.
Do Ent or Prompt Security (SentinelOne) replace EDR?
No. The tools in this guide add control over AI agent actions and work alongside EDR. Ent: Single lightweight agent; SaaS or self-hosted. Prompt Security: Part of Singularity Platform; method not published.
Related
Sources
- ent.ai · Reviewed Sep 2026
- Ent press: intent-aware prevention (30 Jul 2026) · Reviewed Sep 2026
- Ent press: $100M seed (16 Jun 2026) · Reviewed Sep 2026
- Ent company · Reviewed Sep 2026
- SentinelOne Prompt Security page · Reviewed Sep 2026
- SentinelOne press release, 5 August 2025 · Reviewed Sep 2026
- prompt.security · Reviewed Sep 2026