GitHub operates a freemium SaaS business model with four primary revenue pillars: individual subscriptions, team plans, enterprise licensing, and AI-powered product upsells. The model is architecturally elegant: a permanently free tier serves as the acquisition channel for the entire developer ecosystem, while progressively valuable paid tiers capture commercial value from teams and organizations that depend on GitHub for professional work. The free tier is not a loss leader in the traditional sense — it is the mechanism through which GitHub maintains its network effects. Every student who learns to code on GitHub's free plan, every open source contributor who builds their reputation on the platform, and every developer who posts their portfolio projects to public repositories is participating in an ecosystem that makes GitHub more valuable to every paying enterprise customer. Free users generate the social proof, dependency graphs, and community activity that justify enterprise procurement decisions. GitHub Pro, priced at $4 per user per month, serves individual developers who need private repositories, advanced code review tools, and higher usage limits. While Pro contributes modestly to overall revenue relative to enterprise, it serves as an important bridge between free users and organizational buyers. Developers who pay for Pro are demonstrating intent and are more likely to advocate for GitHub within their organizations. GitHub Team, at $4 per user per month for organizations, targets small to mid-size engineering teams. Team includes collaborative features like required reviewers, draft pull requests, and team-level access controls. The per-seat pricing model aligns GitHub's revenue with customer growth: as engineering teams hire more developers, GitHub's revenue from that customer automatically scales. This creates a natural land-and-expand dynamic that enterprise sales teams can exploit without aggressive upselling. GitHub Enterprise is where the majority of GitHub's commercial revenue is generated. Enterprise Cloud, hosted on GitHub's infrastructure, and Enterprise Server, deployed within customer environments, are both priced at $21 per user per month. At this price point, a 500-person engineering organization represents over $126,000 in annual recurring revenue. Large enterprises with thousands of developers generate seven-figure annual contracts. GitHub Enterprise includes SAML single sign-on, advanced audit logging, IP allow lists, and the compliance controls that regulated industries require. GitHub Advanced Security, sold as an add-on, provides code scanning powered by CodeQL, secret scanning across commit history, and dependency review — capabilities that have become table stakes for security-conscious enterprises following high-profile software supply chain attacks. GitHub Copilot represents the most significant business model evolution since the platform's founding. Copilot Individual is priced at $10 per month, Copilot Business at $19 per user per month, and Copilot Enterprise at $39 per user per month. The enterprise tier includes Copilot Chat, personalized responses based on an organization's internal codebase, and fine-tuning capabilities. At $39 per seat, a 1,000-developer enterprise deploying Copilot Enterprise represents $468,000 in incremental annual revenue on top of their existing Enterprise license. This AI upsell layer has fundamentally changed GitHub's revenue ceiling. The marketplace model provides additional monetization through GitHub Marketplace, where third-party developers sell Actions, apps, and integrations. While marketplace revenue is not GitHub's primary growth driver, it reinforces the platform's position as the hub of the developer tooling ecosystem. Popular marketplace tools like Codecov, Dependabot (now native), and dozens of CI/CD integrations increase the stickiness of the overall platform. GitHub's pricing architecture reflects a sophisticated understanding of value-based pricing. The cost of GitHub Enterprise is trivially small relative to the salary cost of the engineers using it. A $21/month per-seat license costs less than one hour of a senior engineer's time. This creates a procurement dynamic where the question is rarely "can we afford GitHub?" and almost always "which tier do we need?" — a position of extraordinary pricing power. The transition from per-feature to per-seat consumption pricing has been a deliberate strategic choice. Per-seat models create predictable, recurring revenue that scales with customer growth. They also create natural expansion revenue as customers hire more developers, without requiring any additional sales effort. This combination of predictability and organic expansion makes GitHub's enterprise business highly attractive from a unit economics perspective. Microsoft's ownership has enabled two critical business model advantages that independent GitHub could never have achieved. First, deep integration with Azure DevOps, Azure Active Directory, and Microsoft 365 creates bundle opportunities and procurement simplicity for Microsoft's existing enterprise customer base. Second, access to OpenAI's models through Microsoft's partnership has given GitHub a structural AI advantage that competitors are struggling to match. The three-way relationship between Microsoft, OpenAI, and GitHub creates a compound moat that extends well beyond any individual product feature.