Claude Code vs Codex CLI: 18 Commands and Flags Compared Side by Side

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The article points out that the two AI coding CLIs use the same flags for different purposes, so a flag that works in one can misfire in the other. In Claude Code, -p runs a prompt and exits, while in Codex CLI it selects a config profile, and -c likewise means continue-last-session in one and config override in the other. The piece lays out 18 common tasks, such as one-shot prompts, stdin input, JSON output, and session resumption, with the equivalent command for each tool. It notes differences in output formats, with Claude returning a single JSON object and Codex streaming JSON Lines events, and in defaults, such as Codex's read-only sandbox for exec runs. The author says the commands reflect the official docs as of October 14, 2026, and that the docs take precedence where they disagree.

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ProgrammingDEV Community ·

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