If Gemini CLI no longer accepts the Google AI free, Pro, or Ultra sign-in flow you used before, the problem may not be your installation. In 2026, Google moved its individual terminal-agent experience to Antigravity CLI.
The Gemini CLI project still exists, but access paths have diverged. Repeating an OAuth tutorial written in 2025 or early 2026 will not reverse an account-eligibility change.
Which users were affected?
Google's official migration announcement states that, from June 18, 2026, Gemini CLI stopped serving requests for these individual tiers:
- Free individual accounts
- Google AI Pro
- Google AI Ultra
Those tiers moved to Antigravity CLI. Google also said the transition applies when these individual tiers were used through Gemini Code Assist IDE extensions or Gemini Code Assist on GitHub.
Which Gemini CLI access paths remain?
Enterprise access was not universally removed. Google said support remains for:
- Gemini Code Assist Standard or Enterprise licenses
- Google Cloud organization access
- Paid Gemini API keys
- Gemini Enterprise Agent Platform API keys
An employee should therefore identify the organization's entitlement and policy before replacing a working setup.
The open-source Gemini CLI repository also remains available. Google said it would continue to receive model support, bug fixes, and security updates. The continued existence of an open-source client and the eligibility of a personal Google account to send requests are separate questions.
What is Antigravity CLI?
Antigravity CLI is the terminal interface for Google Antigravity 2.0. The two products share an agent harness and settings. Google positions the CLI for speed and low overhead, while the desktop application provides a broader graphical workspace.
The official transition material highlights:
- Asynchronous background workflows
- Agent Skills
- Hooks
- Subagents
- Gemini CLI extensions becoming Antigravity Plugins
- The ability to view a CLI conversation from Antigravity 2.0
These concepts carry over from Gemini CLI, but installation, authentication, and some configuration paths changed. Renaming an old binary is not a migration, and installers should come from Google's official domain.
Should you migrate now?
Free, Pro, and Ultra individual users
Use the official Antigravity CLI if you want to continue with Google's terminal agent. This is a product-access transition, not a temporary Gemini CLI OAuth outage.
Enterprise and API-key users
Gemini CLI may still be supported for your environment. If production automation, extensions, and security policies depend on it, test Google's migration guide before scheduling a change instead of removing a working deployment immediately.
Users who only need an IDE integration
A CLI may be unnecessary. Google also lists Antigravity integrations for VS Code, Visual Studio, JetBrains IDEs, Zed, and Xcode, with platform-specific and enterprise support conditions. Check the status shown on the current official download page.
Installing on Windows
Google's download page provides separate Windows PowerShell and Command Prompt installers. The PowerShell command downloads and executes a script from antigravity.google. Confirm that the hostname is Google's official domain before running it, and follow organizational software policies on a managed computer.
After installation, test it in stages:
- Start in a repository with no sensitive data.
- Grant only the paths required for the task.
- Import one setting before migrating every Plugin and MCP server.
- Test reading, planning, and test execution before enabling file writes.
- Verify how background work is interrupted, resumed, and recorded.
How it differs from Codex and Claude Code
The clearest reason to choose Antigravity is an existing Google environment or a prior individual Gemini CLI workflow. Codex has a broad desktop, multi-agent, cloud, and knowledge-work surface. Claude Code emphasizes long-running repository work, subagents, and coordinated Projects.
That is not a permanent ranking of model quality. Account access, repository hosting, IDE, cloud environment, and permission controls should be evaluated first. Then compare the tools on the same real task and measure correctness and human cleanup time.
Full comparison: Codex vs Claude Code vs Antigravity vs Copilot CLI
Official sources
- Google: Gemini CLI transition announcement
- Google: Introducing Antigravity CLI
- Google: Antigravity downloads
- Google: Gemini CLI release notes