GitLab Duo: AI-Powered Support for Modern DevSecOps Teams

This blog explores GitLab Duo – GitLab’s AI extension designed to ease the workload of developers and DevSecOps teams through automation and intelligent assistance. We’ll break down how GitLab Duo works, highlight its most valuable features, discuss the security model, and explain who will benefit most. We wrap up with a concise FAQ on deployment, hosting, and data protection.

Real-World GitLab Duo: More Speed, Higher Quality, Less Friction

GitLab Duo is not just another AI plugin, but rather a set of use-case-specific agents deeply integrated into the development process – from the IDE and merge requests through to pipelines and security analysis. Its capabilities go far beyond simple code suggestions: they understand context, identify vulnerabilities, provide concrete solutions, and fit seamlessly into existing workflows.

What GitLab Duo offers in practice:

• Code completion and refactoring directly in the IDE and GitLab interface – supporting 25+ languages.
  
  
• Test generation, creating sensible unit test suggestions based on existing code.
  
  
• Vulnerability detection and resolution, with automated merge requests for fixes.
  
  
• CI/CD troubleshooting, providing root cause analysis of pipeline errors along with concrete guidance.
  
  
• Code reviews to uphold quality standards within the organisation.
  
  
• Self-hosting options for full control over models and data.
  
  

These AI features are available in tiered licensing models: core functionality is included with GitLab Premium/Ultimate, while full capabilities (including security and enterprise support) require additional add-ons.

Security, Transparency, and Control: What Sets GitLab Duo Apart

A defining aspect of GitLab Duo is how it handles sensitive data. GitLab clearly states that neither user code nor metadata is used to train the AI models. The AI Transparency Centre goes even further by publishing detailed documentation on model behaviour, origin, and safeguards.

For organisations with strict compliance needs, the self-managed option offers full autonomy: GitLab Duo can be hosted in isolated environments with private LLM infrastructure. Supported models include Mistral, Anthropic, and OpenAI – giving teams full control over access, logging, and storage.

When a prompt injection vulnerability was discovered in early 2025, GitLab responded swiftly with updated filters and content sanitisation – reflecting a strong commitment to security best practices.

Who Should Consider GitLab Duo?

GitLab Duo is ideal for:

Development teams seeking productivity gains without sacrificing code quality.

Security engineers who want automated vulnerability resolution with human oversight.

Project managers benefiting from contextual chat summaries and merge request digests.

Organisations with sensitive data, where self-hosting and transparent governance are essential.

Conclusion: AI That Supports – Not Distracts

GitLab Duo exemplifies how AI can be genuinely useful in software engineering – not as a gimmick, but as a productivity booster embedded into day-to-day operations. It helps speed up delivery, improve code safety, and simplify communication. Still, it’s not a replacement for human judgment. Review, oversight and secure coding standards remain essential.

Interested in implementing GitLab Duo within your organisation? Get in touch – we’ll guide you through licensing, technical setup, and compliance-friendly deployment.

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FAQ – Frequently Asked Questions about GitLab Duo: