GitHub AI History: Copilot, Microsoft & Agent Billing

The place code lives

GitHub was founded in February 2008 by Tom Preston-Werner, Chris Wanstrath, P. J. Hyett and Scott Chacon, built around Git, the distributed version control system Linus Torvalds had released three years earlier. It grew into the hosting and collaboration layer most of the software industry now works through: repositories, pull requests, issue tracking, and Actions, its automation and continuous-integration system. Microsoft announced its acquisition of GitHub in June 2018 for $7.5 billion in stock, with the deal closing that October. Thomas Dohmke had led GitHub as chief executive since November 2021 and announced in August 2025 that he would step down at year's end to start a new company. [2][1]

Copilot put a model in the editor

GitHub's place on the timeline runs almost entirely through Copilot, announced as a technical preview in June 2021 and framed by then-CEO Nat Friedman as an AI pair programmer rather than a replacement for the developer. It ran on OpenAI Codex, a code-specialized version of GPT-3, and offered whole-line and whole-function suggestions inside the editor as a developer typed. It reached general availability as a paid subscription in June 2022, moved to GPT-4 by late 2023, and by 2024 let users choose among several vendors' models rather than a single one GitHub picked for them. [3][4]

Training Copilot on public GitHub repositories produced the dispute that has followed the product since: a class action filed in November 2022 argued that reproducing licensed open-source code, even in modified form, is not fair use, and GitHub itself has acknowledged that a small share of Copilot's output can be near-verbatim. This page does not take a side in that dispute; it is unresolved, and the argument is over how much a model can learn from code it was never granted a license to redistribute. [4]

What agentic coding costs

By 2026, GitHub had moved Copilot to usage-based billing, effective June 1. Subscription prices stayed the same, but the flat allotment of premium requests was replaced with a monthly credit balance metered on the tokens a session actually consumes. GitHub's stated reason was that a short chat question and an autonomous agent running for hours had been costing the company the same amount to serve while charging the customer nothing extra, a gap it said had become unsustainable as Copilot shifted from suggesting completions to running multi-step agent sessions on its own. [5]

Not every project stayed

In November 2025, the Zig Software Foundation moved its project off GitHub to Codeberg, a nonprofit alternative. Its president, Andrew Kelley, pointed to a specific GitHub Actions bug, a flawed sleep script that could spin indefinitely under load and leave CI runners silently stalled for weeks, first reported in February 2024 and not fixed until August 2025. He linked the neglect to Microsoft's chief executive telling staff to embrace AI, saying GitHub had since begun running scheduled jobs unpredictably rather than fixing what was broken. The Dillo browser project announced a similar move around the same time, citing its own concerns about GitHub's direction. [6]

Atlas interpretation: Two small open-source projects leaving a platform used by tens of millions of developers is not evidence of a broader exodus. What it documents is a complaint distinct from the Copilot licensing dispute: that GitHub's operational attention shifted toward AI features at a cost to maintaining the infrastructure open-source maintainers already depended on. [6]