Overview
GitHub Copilot is an AI programming assistant jointly developed by GitHub and OpenAI, currently with the largest user base. Launched in 2021, it has surpassed **20 million** paid users by 2026, making it the de facto standard for enterprise AI programming—almost every company using GitHub relies on it.
By 2026, Copilot has fully transformed from 'line-level completion' to an **Agentic Coding platform**: **Agent Mode** (autonomous multi-file editing + running tests + self-correction within the IDE), **Copilot Workspace** (end-to-end delegation from Issue to PR), and **Copilot Coding Agent** (assign tasks to the Agent directly on the GitHub web interface, run in Actions, and automatically open PRs) are now the default experience. On the model side, the June Build conference unveiled **Project Polaris** (Microsoft's self-developed MoE + Maia accelerator), which replaced GPT-4 Turbo as Copilot's default inference engine starting August 2026, with a 3-month GPT-4 fallback period.
On the billing side, **starting June 1, 2026, the pricing model shifted from 'request count' to 'GitHub AI Credits' based on token usage**—the Pro monthly fee remains unchanged but the allowance is replaced by Credits, with overage charged per usage. This is a structural adjustment to accommodate the surge in computing power demands of the Agent era.
Key Features
- Agent Mode (Autonomous Programming in IDE): One-click activation of Agent in VS Code / JetBrains, autonomously editing across multiple files, running tests, reading errors, and self-healing, capable of handling long tasks spanning dozens of steps
- Copilot Coding Agent (Cloud Task Delegation): Assign an Issue directly to @copilot on the GitHub web interface, run the Agent in Actions, automatically open PRs, and iterate based on reviews—get Copilot to work without opening the IDE
- Copilot Workspace (Task-Driven Development): Automatically generate a complete plan from an Issue → multi-file changes → tests → PR, GA at Build on June 2, 2026
- Copilot Chat + Edits: Conversational programming within the IDE + inline multi-file editing, serving as the second daily entry point beyond code completion
- Project Polaris Self-Developed Model: Microsoft's MoE + Maia accelerator, replacing GPT-4 Turbo as Copilot's default engine from August 2026, with particularly significant improvements for niche languages like Rust/Haskell, free upgrade for all paid tiers
- Copilot Extensions: Third-party tools like Jira, Datadog, ServiceNow, and Sentry can be directly invoked by the Agent as extensions within Copilot sessions
- Full IDE / Full Language Coverage: Full coverage across VS Code, JetBrains suite, Neovim, Visual Studio, and Xcode, supporting virtually all major programming languages
Use Cases
- Daily code completion and refactoring for VS Code / JetBrains users
- Batch delegation of GitHub Issues to AI via Coding Agent (dependency updates, test completion)
- Running test-driven development and large multi-file changes with Workspace
- Enterprise teams adding AI automation to existing GitHub + Actions workflows
- Free usage for students / open-source maintainers as an entry-level AI programming tool
Pros
- Largest user base and highest enterprise penetration, with over 20 million paid users in 2026
- Native GitHub integration (Issue / PR / Actions / RBAC) is an advantage that other tools cannot replicate
- Coding Agent makes 'assigning tasks to AI on the GitHub web interface' a mainstream experience, covering scenarios not addressed by IDE tools like Cursor
- The latest official tagline emphasizes 'Your AI accelerator for every workflow, from the editor to the enterprise,' covering the entire workflow from individual to enterprise
Summary
GitHub Copilot is suitable for all developers using GitHub, especially VS Code/JetBrains users, enterprise teams, and open-source maintainers. Its core advantages lie in deep native integration with GitHub (Issue/PR/Actions), full-process automation enabled by the Agentic Coding trio (Agent Mode, Coding Agent, Workspace), and performance improvements brought by the self-developed Polaris model. It is currently the AI coding assistant with the largest user base and the highest enterprise adoption rate.
Version History
- GitHub Copilot 应用新增堆叠会话与拉取请求功能 (2026-07-30): GitHub Copilot app launches stacked sessions feature, allowing users to create a series of interdependent tasks in the same repository, with each session building on the results of the previous one. The author demonstrates this feature using a personal project with over a decade of history: first using Plan mode to create a frontend modernization plan, then using stacked sessions to break the React-Bootstrap replacement work into independent sessions, automatically creating a corresponding pull request for each session to avoid scope creep.