Codex Security alternatives
Codex Security by OpenAI costs Free (OSS) and is open source. If you need something cheaper, open source, self-hosted or simply different, here are 7 alternatives that do the same job, ranked by how widely they are used, with the differences that matter.
7 Codex Security alternatives, by popularity
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A self-hosted multi-agent system that carries out penetration testing tasks in a sandboxed environment, written in Go and React and working with several model providers.
- Less widely used (Gid Score 31 vs 73)
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An open-source multi-agent penetration testing tool that runs dynamic tests against applications, validates findings with working proofs of concept and proposes fixes; it runs locally with Docker or as a hosted service.
- Less widely used (Gid Score 25 vs 73)
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Horizon3.ai's autonomous pentesting platform that runs real attack techniques against internal, external, cloud, Kubernetes, Active Directory and web-app environments to show which weaknesses can be exploited.
- Proprietary
- Less widely used (Gid Score 18 vs 73)
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An autonomous offensive security platform that attacks web applications, chains findings into working exploits and reports vulnerabilities with reproducible proof, for continuous testing rather than periodic manual pentests.
- Proprietary
- Less widely used (Gid Score 11 vs 73)
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A Python framework from Alias Robotics for building and running AI security agents for reconnaissance, exploitation, privilege escalation and defensive tasks, with guardrails and human-in-the-loop controls.
- Less widely used (Gid Score 10 vs 73)
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An AI SOC analyst that investigates security alerts end to end across connected SIEM, EDR, cloud, identity and email tools and returns a verdict with the evidence and reasoning.
- Proprietary
- Less widely used (Gid Score 0 vs 73)
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Microsoft-built and partner-built agents inside Defender, Entra, Intune, Purview and Sentinel that handle tasks such as phishing triage, data-loss alert triage, Conditional Access optimisation and vulnerability remediation.
- Proprietary
Codex Security vs alternatives at a glance
| Agent | Price | Free to start | Open source | MCP | Local models | Gid Score |
|---|---|---|---|---|---|---|
| Codex Security | Free (OSS) | ✓ | ✓ | ? | ? | 73 |
| PentAGI | Free (OSS) | ✓ | ✓ | ? | ? | 31 |
| Strix | Free + $29/mo | ✓ | ✓ | ? | ? | 25 |
| NodeZero | Custom | ✕ | ✕ | ? | ? | 18 |
| XBOW | Usage-based | ✕ | ✕ | ? | ? | 11 |
| CAI (Cybersecurity AI) | Free | ✓ | ? | ? | ? | 10 |
| Dropzone AI | Custom | ✕ | ✕ | ? | ? | 0 |
| Microsoft Security Copilot agents | Usage-based | ✕ | ✕ | ? | ? | — |
Prices from the vendors' pricing pages; features from official docs (“?” means not documented). Full feature comparison · All prices
FAQ
What is the best alternative to Codex Security?
By usage, the closest alternative is PentAGI, followed by Strix, NodeZero, XBOW.
Is there a free alternative to Codex Security?
Yes. PentAGI is free to start.
Is there an open-source alternative to Codex Security?
Yes. PentAGI is open source.
How do these Codex Security alternatives compare on price?
PentAGI: Free (OSS); Strix: Free + $29/mo; NodeZero: Custom; XBOW: Usage-based; CAI (Cybersecurity AI): Free; Dropzone AI: Custom.
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