Alternatives

Best Codex Alternative

Codex alternatives surface when you want Anthropic's models, more robust agent loops, or a workspace around the agent.

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What to look for in a Codex alternative

  • Different model vendors
  • GUI session management
  • Worktree isolation

Recommended options

Agentastic

Our pick

Native macOS workspace for running 30+ AI coding agents in parallel git worktrees. Built-in editor, browser, diff viewer, and code review.

Claude Code

Anthropic's CLI coding agent. Solid one-session option if you don't need parallel agents.

Gemini CLI

Google's coding-agent CLI built around Gemini models.

OpenCode

Open-source AI coding agent. BYO model, run it from your terminal.

How to switch from Codex cleanly

Run Codex inside Agentastic alongside Claude Code, Gemini, or any other agent. Best of all worlds.

Common questions

Can I use Codex and Claude Code on the same repo?

Yes — easiest way is two Agentastic worktrees on the same branch. Compare diffs after.