Lesson 77 of 1455
Claude Code vs. Codex CLI vs. Grok Code — the coding agent picker
Three command-line coding agents, three flavors. Which one belongs in your terminal? Install all three on a weekend and decide for yourself, but here is the cheat sheet.
Builders · Model Families · ~18 min read
The terminal is where coding agents live
By April 2026, every major lab has a command-line coding agent. They all do similar things: read your repo, run tests, edit files, commit. They feel very different in practice because the models underneath have different personalities and the tooling makes different bets.
The three mainline CLIs
Compare the options
| Feature | Claude Code | Codex CLI | Grok Code Fast |
|---|---|---|---|
| Base model | Claude Opus 4.7 / Sonnet 4.6 | gpt-5.5 (Codex), gpt-5.3-codex fast | grok-code-fast |
| Subagents | Up to 10 parallel | No native subagents | Limited |
| Skills / slash commands | Unified under .claude/skills/ | .codex/ | xAI config |
| Hook system | 25 lifecycle events | Limited | Early |
| MCP support | Native | Native (since gpt-5.3) | Native |
| Price | Claude Pro $20/mo includes | ChatGPT Plus $20/mo | SuperGrok $30/mo |
| Autonomy sweet spot | Multi-file refactor 30-90 min | Autonomous PR generation, cloud tasks | Fast edits, IDE-adjacent |
Pick Claude Code if
- Your work involves multi-file, long-horizon refactors
- You want to orchestrate subagents for parallel investigation
- You value the skills/hooks ecosystem for custom workflows
- You already pay for Claude Pro
Pick Codex CLI if
- You want autonomous PR generation triggered from GitHub issues (via codex cloud)
- You need `codex exec` for scripted CI jobs
- You prefer OpenAI's ecosystem and want Computer Use too
- Your team already uses ChatGPT Enterprise
Pick Grok Code Fast if
- Cost per call is critical ($0.20/$1.50 per M tokens, very cheap)
- You are doing IDE-style autocomplete style edits, not long-horizon autonomy
- You already use X and SuperGrok
The install dance
The convergence is not accidental. Users want to use the same muscle memory across agents.
# Claude Code npm install -g @anthropic-ai/claude-code claude login # Codex CLI npm install -g @openai/codex codex auth # Grok Code (xAI CLI, newer) npm install -g @x-ai/grok-cli grok login # All three expose similar commands: # <cli> chat interactive session # <cli> run one-shot command # <cli> /skills list installed skills (Claude Code and Codex)“The coding agent is not replacing engineers — it is replacing the bottom 20% of each engineer's day, the part nobody enjoyed.”
Key terms in this lesson
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