Prepare the account and verification
Use an email and phone number you control. If the official site asks for phone verification, enter the code only on the official domain. AGG support may guide the process, but should never keep your password, recovery code or session.
Do not buy a pre-made account or accept an API key sent by a stranger. The finished account must remain recoverable by you.
Claude
Create or sign in to the account used for Claude and Claude Code.
Open claude.aiOpenAI
Create or sign in to the account used for ChatGPT and Codex.
Open OpenAI sign-inChoose the tool before downloading
Claude Code and Codex are separate coding agents. Install only the one your account and workflow need; installing both is optional.
Claude Code
Use Anthropic authentication or an approved enterprise/API route.
Open official Claude Code docsCodex CLI
Use ChatGPT sign-in or an OpenAI API key according to the official flow.
Open official Codex CLI docsInstall from the official package
Node.js and Git may be prerequisites depending on the tool and operating system. Keep each download beside the step that uses it.
Node.js LTS
Official installer for Windows or macOS. Choose the LTS release.
Download Node.jsGit for Windows
Needed for Claude Code native Windows workflows using Git Bash.
Download Gitnpm install -g @anthropic-ai/claude-codenpm install -g @openai/codexDo not add sudo on Windows. If npm reports a permission error on macOS, use the official troubleshooting path instead of forcing administrator access.
Prove the component is installed
Run the checks for the tool you installed, then paste the complete terminal output below. This check stays in your browser and does not upload the text.
Write-Output "NODE $(node --version)"
Write-Output "NPM $(npm --version)"
Write-Output "GIT $(git --version)"
Write-Output "CLAUDE $(claude --version)"
Write-Output "CODEX $(codex --version)"Local output check
For one-tool installs, an error on the unused Claude or Codex line is fine. At least one agent must return a version.