Claude Code vs Codex
Claude Code is Anthropic's CLI agent. Codex is OpenAI's. Both run from the terminal, both edit files in place, both can use tools. Pick based on which underlying model you trust for your work — and if you want to run them on the same repo at once for an A/B, do it inside Agentastic, which gives each one its own git worktree.
Who should choose each option
Claude Code
Choose Claude Code if you prefer Anthropic's models (Sonnet/Opus) and its tool-use behavior.
Codex
Choose Codex if you prefer OpenAI's models and its agent loop.
Feature comparison
| Claude Code | Codex | |
|---|---|---|
| Vendor | Anthropic | OpenAI |
| Default model | Claude Sonnet / Opus | GPT-class |
| Pricing | Claude Pro / Max / API | OpenAI API or ChatGPT |
| Worktree isolation | Manual | Manual |
| GUI | No (CLI) | No (CLI) |
Pricing
Claude Code
Bundled with Claude Pro / Max / API.
Codex
OpenAI API or ChatGPT plan.
Using them together
Run them side by side in Agentastic — one Claude Code worktree and one Codex worktree on the same task — and compare the diffs they produce. This is the fastest way to decide which model fits a given codebase.
Frequently asked questions
Can I run both Claude Code and Codex at the same time?
Yes — easiest way is in two Agentastic worktrees on the same repo. They never see each other's changes until you merge.
Which one is better at long tasks?
It depends on the task and the model. Run them in parallel in Agentastic and compare the diffs.
See also
Agentastic vs Claude Code
Compare Agentastic and Claude Code. Claude Code is Anthropic's CLI agent. Agentastic is a native macOS workspa…
Agentastic vs Codex
Compare Agentastic and OpenAI's Codex CLI. Codex is OpenAI's coding agent. Agentastic is a native macOS worksp…
Agentastic vs Conductor
Compare Agentastic and Conductor. Both run multiple Claude Code agents in parallel on macOS. Agentastic ships …