HEAD-TO-HEAD · FACTS ONLY
Koi vs Onyx: AI endpoint control facts side by side
Short answer
By The Device Desk · Endpoint AI Finder · Published 2026-10-11
Desk research from public vendor pages read on 27 September and 11 October 2026. Profiles follow our published method; we did not run the products.
Vendor pages read September and October 2026 · updated 2026-10-13
Where do their controls sit?
- Filled or hatched marker: Koi
- Dashed teal ring: Onyx, described
- DEV Filled marker: described on the product pages we read
- DEV Hatched marker: partly described (another component, a narrower scope, or method not detailed)
- DEV Dashed marker: not in our sources (it may exist; we did not find it)
What are the facts, side by side?
| Fact | Koi | Onyx |
|---|---|---|
| Owner | Palo Alto Networks (acquisition completed 14 April 2026) | None |
| Positioning | Koi, now sold by Palo Alto Networks as Cortex Agentic Endpoint Security, gives visibility into models, MCPs and extensions on endpoints, removes insecure packages, extensions and AI tools in one click, and stops malicious actions. | "The Secure AI Control Plane for the Agentic Era": inline inspection of prompts, tool calls and model responses across browser AI, coding assistants, desktop AI agents, cloud workloads and MCP servers. Based in Tel Aviv and New York. |
| How it reaches devices | Available as a Cortex XDR module or as a standalone agent. koi.ai now redirects to the Palo Alto Networks page. Source: Palo Alto Networks: Cortex Agentic Endpoint Security · Read 27 Sep 2026 | Endpoint agents, browser extensions, APIs and gateways. Source: Onyx Security: AI security platform · Read 27 Sep 2026 |
| On-device control | DescribedAgent-based visibility into models, MCPs and extensions, one-click removal of insecure packages, extensions and AI tools, and blocking of unsafe AI application interactions. Source: Palo Alto Networks: Cortex Agentic Endpoint Security · Read 27 Sep 2026 | DescribedEndpoint agents cover coding assistants and desktop AI agents. Source: Onyx Security: AI security platform · Read 27 Sep 2026 |
| Browser extensionDiffers | Not in our sourcesNot described on the pages we read. | DescribedBrowser extensions cover browser AI. Source: Onyx Security: AI security platform · Read 27 Sep 2026 |
| Network or SSE proxy | Not in our sourcesNot described on the pages we read. | Not in our sourcesNot described on the pages we read. |
| AI or MCP gatewayDiffers | Not in our sourcesNot described on the pages we read. | DescribedGateways and APIs inspect traffic inline. Source: Onyx Security: AI security platform · Read 27 Sep 2026 |
| Names the coding agents it coversDiffers | MatchesA Palo Alto Networks blog of 18 August 2026 names Claude Code, Cursor, Codex and Antigravity. Source: Palo Alto Networks blog: A Quarter of Innovation with Koi Agentic Endpoint Security · Read 11 Oct 2026 | PartlyCovers coding assistants; specific tools are not named on the pages we read. Source: Onyx Security: AI security platform · Read 27 Sep 2026 |
| Decides on a tool call before it runsDiffers | PartlyBlocks unsafe AI application interactions and prevents prompt injections; decisions on individual tool calls are not described. Source: Palo Alto Networks: Cortex Agentic Endpoint Security · Read 27 Sep 2026 | MatchesInspects every prompt, tool call and model response inline. Source: Onyx Security: AI security platform · Read 27 Sep 2026 |
| Controls what goes into browser AIDiffers | Not in our sources | MatchesCan mask data in browser AI as well as block it. Source: Onyx Security: AI security platform · Read 27 Sep 2026 |
| Rolls out through EDR or device management you runDiffers | PartlyA Cortex XDR module, or its own standalone agent. Source: Palo Alto Networks: Cortex Agentic Endpoint Security · Read 27 Sep 2026 | Not in our sources |
| Can warn or ask instead of only blockingDiffers | Not in our sources | MatchesFive actions: alert, block, mask, steer or ask. Source: Onyx Security: AI security platform · Read 27 Sep 2026 |
| Can block an agent, tool or action | MatchesStops malicious actions and removes insecure packages, extensions and AI tools in one click. Source: Palo Alto Networks: Cortex Agentic Endpoint Security · Read 27 Sep 2026 | MatchesBlock is one of five actions. Source: Onyx Security: AI security platform · Read 27 Sep 2026 |
| Has a watch-only or simulation modeDiffers | Not in our sources | PartlyAlert is one of five actions; a simulation mode is not described. Source: Onyx Security: AI security platform · Read 27 Sep 2026 |
| Records who or what took each actionDiffers | Not in our sources | PartlyIntegrates with Okta, Entra and Splunk; separating a person from an agent is not described. Source: Onyx Security: AI security platform · Read 27 Sep 2026 |
| Also covers SaaS, cloud or homegrown AIDiffers | PartlyPalo Alto Networks plans integration with Prisma AIRS, its wider AI security platform. Source: Palo Alto Networks press release: acquisition of Koi completed · Read 27 Sep 2026 | MatchesCloud workloads and MCP servers as well as devices. Source: Onyx Security: AI security platform · Read 27 Sep 2026 |
| Has a public price or tiers (vendor site or marketplace) | Not in our sources | Not in our sources |
| Built into | Offered as a Cortex XDR module. Source: Palo Alto Networks press release: acquisition of Koi completed · Read 27 Sep 2026 | None |
| Works with | None in our sources | Lists CrowdStrike among its integrations. Source: Onyx Security: AI security platform · Read 27 Sep 2026 |
| Price | Not published. Source: Palo Alto Networks: Cortex Agentic Endpoint Security · Read 27 Sep 2026 | Not published. Source: Onyx Security homepage · Read 27 Sep 2026 |
Where do they differ?
- Browser extension: Koi is not in our sources; Onyx describes it.
- AI or MCP gateway: Koi is not in our sources; Onyx describes it.
- Names the coding agents it covers: Koi matches; Onyx partly matches.
- Decides on a tool call before it runs: Koi partly matches; Onyx matches.
- Controls what goes into browser AI: Koi is not in our sources; Onyx matches.
- Rolls out through EDR or device management you run: Koi partly matches; Onyx is not in our sources.
- Can warn or ask instead of only blocking: Koi is not in our sources; Onyx matches.
- Has a watch-only or simulation mode: Koi is not in our sources; Onyx partly matches.
- Records who or what took each action: Koi is not in our sources; Onyx partly matches.
- Also covers SaaS, cloud or homegrown AI: Koi partly matches; Onyx matches.
Choose Koi if
- You already run Palo Alto Networks Cortex XDR
- You want to find and remove risky extensions and packages across the fleet
Choose Onyx if
- You want masking or steering rather than only allow or block
- AI use spans the browser, desktop apps, coding tools and cloud workloads
Which limits should you check?
Koi
- Agent-based: it adds an agent unless you run it as a Cortex XDR module.
- Warn or ask actions and a record that separates a person from an agent are not described on the pages we read, and no pricing is published.
Onyx
- Uses its own endpoint agents and browser extensions, so there is something new to roll out to devices.
- No pricing published, and specific coding agents are not named on the pages we read.