Head to head · Checked against vendor sites, September 2026
Bay vs Prompt Security (SentinelOne): AI agent security compared
The verdict
Bay scores higher overall on our weights (7.9 vs 6.6 out of 10). Bay scores higher on visibility, tool-call control, policy, footprint and identity and audit; Prompt Security scores higher on maturity and breadth. Neither publishes list prices.
Prompt Security (SentinelOne)
Owner: SentinelOne (acquisition announced 5 August 2025)
Best for SentinelOne customers
How do Bay and Prompt Security compare on each criterion?
| Criterion | Weight | Bay | Prompt Security | Edge |
|---|---|---|---|---|
| Visibility | 22% | 9 | 7 | Bay |
Why these scoresBay: Inventories AI agents, MCP servers, tools, credentials, extensions, settings and endpoint deployments, with 200+ detection rules (bay.io blog). Prompt Security: Inventories AI tools and code assistants, including shadow AI, and maps agents and MCP servers. | ||||
| Tool-call control | 20% | 9 | 6 | Bay |
Why these scoresBay: Evaluates prompts, pre-tool calls and post-tool responses and returns Allow, Ask or Deny locally, stated as under 4ms, on supported agent surfaces. Prompt Security: Governs what agents and MCP servers can do; per-tool-call enforcement is not detailed. | ||||
| Policy | 15% | 9 | 7 | Bay |
Why these scoresBay: Session-aware decisions using identity, prior actions and data accessed; capability rules for shell, code execution, package installs, cloud CLIs, containers, Kubernetes, browser automation; Simulation Mode. Prompt Security: Prevents prompt injection and data leakage for tools such as GitHub Copilot, Cursor and Claude Code. | ||||
| Identity and audit | 12% | 8 | 5 | Bay |
Why these scoresBay: Activity records who triggered an action, whether a human was involved, and the chain from prompt to system action. Prompt Security: Agent vs human attribution not described on the pages we reviewed. | ||||
| Footprint | 13% | 9 | 6 | Bay |
Why these scoresBay: Deploys through existing EDR or MDM as an ephemeral binary (Wave); Bay describes itself as agentless. Prompt Security: Built into the SentinelOne Singularity Platform; the deployment method is not detailed. | ||||
| Breadth | 8% | 4 | 8 | Prompt Security |
Why these scoresBay: Endpoint only by design; no public material on SaaS agents, cloud AI apps or red teaming. Prompt Security: Employees, developers and homegrown AI apps from testing to runtime. | ||||
| Maturity | 10% | 3 | 8 | Prompt Security |
Why these scoresBay: Smallest public footprint in this guide: two blog posts, no public documentation portal and no published pricing; SOC 2 and ISO 27001 are claimed on bay.io. Prompt Security: Backed by SentinelOne, which announced the acquisition on 5 August 2025; pricing not published. | ||||
| Total | 100% | 7.9 | 6.6 | Bay |
How do they deploy, and what do they cost?
| Attribute | Bay | Prompt Security |
|---|---|---|
| Owner | Not acquired | SentinelOne (acquisition announced 5 August 2025) |
| How it reaches devices | Through existing EDR or MDM (ephemeral binary) | Part of Singularity Platform; method not published |
| Deployment detail | Bay states that it deploys through your existing EDR or MDM using Wave, an ephemeral binary that runs, scans and exits. It describes the product as agentless by design, with no new agent or tool to install, and says full deployment takes under 5 minutes (vendor-stated). Enforcement then happens locally on the device. In practice this means Bay runs beside your EDR, not in place of it. | 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. Bay does not publish pricing. Demo requests go through bay.io/demo. | Contact sales. Pricing is not published. |
Source: bay.io home page · Bay blog: Ghostjacking (Aug 2026) · Bay blog index · Bay demo page · SentinelOne Prompt Security page · SentinelOne press release, 5 August 2025 · prompt.security · Reviewed Sep 2026
Which should you choose?
Choose Bay if
- Your priority matches our designation for Bay: editors' pick for endpoint agent control.
- You need to evaluate or stop individual tool calls before they run: Bay scores 9 to 6.
- You want a light rollout with published deployment detail, ideally through existing EDR or MDM: Bay scores 9 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 3.
- Your agents also run in SaaS platforms, cloud workloads or apps you build: Prompt Security scores 8 to 4.
Frequently asked questions
Which is better, Bay or Prompt Security (SentinelOne)?
Bay scores higher overall on our weights (7.9 vs 6.6 out of 10). Bay scores higher on visibility, tool-call control, policy, footprint and identity and audit; Prompt Security scores higher on maturity and breadth. Scores are editorial assessments from public vendor material, reviewed September 2026.
Do Bay and Prompt Security (SentinelOne) publish prices?
No. Neither publishes list prices, so ask both for a quote.
Do Bay or Prompt Security (SentinelOne) replace EDR?
No. The tools in this guide add control over AI agent actions and work alongside EDR. Bay: Through existing EDR or MDM (ephemeral binary). Prompt Security: Part of Singularity Platform; method not published.
Related
Sources
- bay.io home page · Reviewed Sep 2026
- Bay blog: Ghostjacking (Aug 2026) · Reviewed Sep 2026
- Bay blog index · Reviewed Sep 2026
- Bay demo page · Reviewed Sep 2026
- SentinelOne Prompt Security page · Reviewed Sep 2026
- SentinelOne press release, 5 August 2025 · Reviewed Sep 2026
- prompt.security · Reviewed Sep 2026