A new Forrester Consulting Total Economic Impact study found that organizations using GitLab Duo Agent Platform achieve a 400% return on investment and $7.5 million in net present value over three years, with payback in under six months. The study is based on interviews with four decision-makers across various industries who use the platform in production. The study combined their experiences into a single composite organization, a global company with $3 billion in annual revenue and 3,000 employees. The organization achieved significant benefits, including a 400% return on investment and $7.5 million in net present value, by addressing manual tasks, interruptions, and code review bottlenecks. Before adopting the platform, teams depended on manual processes, senior-engineer expertise, and ad-hoc knowledge sharing to build, review, and secure software. The study quantified four benefit areas, totaling $9.4 million in risk-adjusted benefits against $1.9 million in costs, including faster onboarding, migration, security remediation, and time saved. New developers onboarded 80% faster, and a migration budgeted for eight months finished in two, resulting in significant labor savings. Security and QA engineers also got 40% of their time back, and every developer got 20% more of their week back for feature work. The study provides a framework for building a business case for agentic infrastructure for software engineering, grounded in the experiences of four enterprises. The full study, commissioned by GitLab and delivered by Forrester Consulting, provides a complete methodology, financial model, and interview findings, and is available for organizations to learn from and apply to their own situations.