Claude Opus 4.8: Can It Finally Write Secure Code?

Snyk

Jun 8, 2026

We put Anthropic’s new Claude Opus 4.8 to the test using our standard benchmark: building a secure, production-ready Notes app. Anthropic claims this model is four times less likely to let security flaws slip through. Operating on "Ultra Code" mode, the AI navigates environment blocks, writes its own E2E security test suite, and runs dependency audits. We walkthrough the final app and run a security scan using the Snyk CLI to see if Claude's code is truly safe to deploy.

Use Snyk for free to find and fix security issues in your applications today! https://snyk.co/ugLYn

✍️ Resources ✍️

Claude Opus 4.8 Announcement: https://www.anthropic.com/news/claude-opus-4-8
GitHub Repository: https://github.com/clarkio/ai-code-security/

⏲️ Chapters ⏲️

00:00 The Opus 4.8 Security Claim

01:00 The Security Prompt and Setup

02:45 Claude's Security Plan and Coding

06:38 Custom Security Tests Breakdown

08:55 Testing the App and UX

11:22 Snyk CLI Security Scan Results

13:27 Final Verdict

⚒️ About Snyk ⚒️

Snyk helps you find and fix vulnerabilities in your code, open-source dependencies, containers, infrastructure-as-code, software pipelines, IDEs, and more! Move fast, stay secure.

Learn more about Snyk: https://snyk.co/ugLYl

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