Lesson 77 of 1570
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.
Lesson map
What this lesson covers
Learning path
The main moves in order
- 1The terminal is where coding agents live
- 2The three mainline CLIs
- 3The install dance
Concept cluster
Terms to connect while reading
Section 1
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.
Section 2
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
Section 3
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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