Originally published on rohitraj.tech
OpenAI open-sourced Codex Security under Apache-2.0 — a CLI and TypeScript SDK that builds a threat model of your repo, then runs an isolated validator to prove a finding is exploitable before it reports it. Here's how that differs from Snyk, Semgrep and CodeQL, the real commands, and the three cases where I'd still reach for Semgrep instead.
Read the full version with code samples, diagrams, and architecture details: OpenAI Codex Security vs Snyk vs Semgrep vs CodeQL: What the New Open-Source Scanner Actually Changes (2026)
More engineering notes: rohitraj.tech/en/notes
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