GitLab Duo

GitLab

GitLab's AI assistant built into the DevSecOps platform: code suggestions in your IDE, merge-request summaries, vulnerability explanations and root-cause analysis across the whole lifecycle.

Product preview

Overview

Every AI coding assistant can complete a function; GitLab Duo's bet is that most engineering time is spent everywhere except writing functions. Duo attaches AI to the whole DevSecOps pipeline: merge requests arrive pre-summarized with suggested reviews, vulnerabilities come with plain-language explanations and fix guidance, CI failures route through root-cause analysis, and the IDE assistant handles code suggestions inside that workflow.

For platform teams the differentiator is governance: Duo runs on GitLab's infrastructure with enterprise controls, and Duo Self-Hosted lets regulated organizations point it at their own approved models entirely. Raw code-completion quality trails the specialist agents, but no other assistant covers the security, review and CI surface as completely — inside a GitLab shop, that breadth is what converts into saved hours.

Pros / Cons

Pros

AI across the full lifecycle, not just the IDE
Self-hosted model option for regulated teams
Security findings explained in plain language
Bundled pricing with GitLab tiers

Cons

Completion quality trails specialist agents
Value confined to GitLab-based workflows
Higher tiers needed for the full feature set

Who it's for

Teams standardized on GitLab CI/CD

Security-conscious software delivery

Reducing merge-request review overhead

Regulated environments needing private models

Bottom line

Already on GitLab? Duo is the AI assistant that meets your pipeline where it lives.

Key Features

IDE code suggestions

MR summaries & reviews

Vulnerability explanations

CI root-cause analysis

Self-hosted model option

Compare GitLab Duo with alternatives

GitLab Duo vs GitHub Copilot GitLab Duo vs Cursor GitLab Duo vs Windsurf 4 products · Code Generation

Frequently asked questions

What is GitLab Duo?

GitLab Duo is a Code Generation tool developed by GitLab. The company was founded in 2023 and is headquartered in San Francisco, USA. GitLab's AI assistant built into the DevSecOps platform: code suggestions in your IDE, merge-request summaries, vulnerability explanations and root-cause analysis across the whole lifecycle.

Is GitLab Duo free?

No — GitLab Duo is a paid product. Check the official website for current plans and pricing.

Is GitLab Duo open source?

No — GitLab Duo is proprietary software.

What are the best alternatives to GitLab Duo?

Notable Code Generation alternatives include GitHub Copilot, Cursor, Windsurf. Browse all 4 tools in our Code Generation category for a full overview.

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