Timeline

Claude Fable 5, Claude Haiku 4.5, Gemini 3.8 Flash, Gemini 4 Argon, Grok 4.6, and Kimi K3 are deprecated across Copilot experiences; individual annual-plan subscribers retain Claude Haiku 4.5.

The legacy GitHub app for Microsoft Teams retires; users must install the consolidated app to continue using Copilot in Teams.

Gemini 4 Hydrogen becomes generally available in GitHub Copilot for Pro, Pro+, Max, Business, and Enterprise users, with gradual rollout.

GitHub Enterprise Server support becomes generally available in GitHub Copilot app 1.2.0 and later; cloud sessions are unavailable.

Bring Your Own Model becomes generally available in Visual Studio 18.12.

Copilot Chat in Visual Studio switches to the Microsoft Copilot SDK-powered engine, enabled by default in version 18.12.

Gemini 4 Carbon becomes generally available in GitHub Copilot with gradual rollout.

Claude Fable 5.2 becomes generally available in GitHub Copilot.

@GitHub in Slack and Teams becomes generally available for conversation-based coding workflows.

GitHub Copilot becomes available in JetBrains Air using existing Copilot subscriptions.

GitHub Copilot enters public preview in Xcode’s built-in coding assistant, starting with Xcode 27.3 beta.

GitHub Copilot becomes available as a default agent in JetBrains Air through Agent Client Protocol.

GitHub Copilot becomes available in public preview in Xcode’s built-in coding assistant.

GitHub Copilot becomes available through JetBrains Air’s Cloud Run experience, extending existing local execution support.

GitHub Copilot becomes available in JetBrains Air for local and cloud coding tasks.

The GitHub app for Microsoft Teams becomes generally available with integrated notifications and GitHub Copilot development workflows.

Agent Host Protocol reaches version 1.0.

Copilot access is now included for licensed GitHub Enterprise users at enterprises working with a GitHub or Microsoft account team.

GitHub introduces Copilot code review Max for deeper review of changes.

Computer use enters public preview on macOS and Windows, enabling Copilot to interact with desktop apps.

Shared Copilot Automations begin rolling out, enabling repository-owned workflows maintained by teams.

Copilot dreaming enters public preview to improve future sessions using past work.

GitHub Copilot Fusion becomes generally available for automatic model routing and multi-model orchestration.

Intelligent routing between supported local and cloud models enters opt-in experimental preview.

Users on paid Copilot plans receive a limited-time 30% discount on model costs when using Copilot Fusion.

GitHub Copilot Memory becomes generally available on paid Copilot plans.

The GitHub security extension enters public preview for reviewing and fixing code scanning alerts within the GitHub Copilot app.

Image generation and editing become available in public preview for Copilot Pro, Pro+, Business, and Enterprise.

Repository plugin defaults and enterprise-managed plugin controls become generally available across VS Code, Copilot CLI, and the GitHub Copilot app.

Copilot projects become available in the GitHub Copilot app for parallel agent work across multiple repositories.

Copilot Projects becomes available in public preview for coordinating context, agents, and results across repositories.

The unified Copilot harness becomes available in Foundry as a managed service for long-running agents.

Server-to-server authentication for organization-installed GitHub Apps becomes available in public preview.

Assisted permissions become generally available in GitHub Copilot CLI, GitHub Copilot app, and Visual Studio Code.

GPT-6.1 Terra becomes generally available in GitHub Copilot, with gradual rollout across supported clients.

BYOM requires the new Agent preview harness, removing support from previous Ask and Agent modes.

The consolidated GitHub app brings Copilot coding actions to repository notifications in Microsoft Teams.

Global default policy becomes generally available, with enforcement rolling out through October 26.

GitHub Copilot deprecates Gemini 3.7 Flash, GPT-5.5, GPT-5.4, GPT-5.4 mini, GPT-5 mini, and Grok 4.5 across most experiences.

REST API endpoints for retrieving and updating model policies become generally available at four scopes.

GitHub Copilot becomes a native agent option in JetBrains AI Assistant, accessible with a valid Copilot subscription.

Replaces fixed monthly premium request quotas with a flexible token-based billing model. Cost scales with actual model usage — heavier models like Claude Opus consume more tokens per interaction while lighter models cost less. Gives individuals and organizations fine-grained control over AI spend without hard request caps.

Organization-wide Custom Instructions: Lets administrators define Copilot instructions that apply across all repositories in an organization. Enforce coding standards, preferred libraries, security practices, and domain context centrally — every developer's Copilot interactions automatically follow these guidelines without per-repo setup.

GPT-5.1 models, including GPT-5.1-Codex and Codex-Mini, become available in Copilot for Xcode.

Custom agents become available in Xcode.

Plan Mode becomes available in Xcode for planning, executing, and validating multi-step tasks.

Subagents become available in Xcode with isolated contexts and automatic invocation in Agent Mode.