Both cost $20/mo. The difference is what they do.
Anthropic's terminal coding agent
OpenAI's coding agent: CLI + autonomous cloud PRs
Both are CLI-first coding agents from frontier labs. Claude Code leans further into autonomy — subagents, MCP, file-system-aware planning. OpenAI Codex CLI leans into reasoning depth, with GPT-5 / o-series models doing more silent thinking before acting. Pick by model family preference; the form factor is similar.
Claude Code and Codex are alternatives in the Coding agents category. Claude Code: Anthropic's terminal coding agent. Codex: OpenAI's coding agent: CLI + autonomous cloud PRs. Both cost $20/mo.
| Attribute | Claude Code | Codex |
|---|---|---|
| Vendor | Anthropic | OpenAI |
| Default model | Claude Sonnet 4.6 / Opus 4.7 | GPT-5 / o-series |
| Subagents | First-class | Single-agent |
| MCP support | Native, mature | Yes |
| Best at | Multi-file sweeps + planning | Hard reasoning + novel logic |
Both are CLI-first coding agents from frontier labs. Claude Code leans further into autonomy — subagents, MCP, file-system-aware planning. OpenAI Codex CLI leans into reasoning depth, with GPT-5 / o-series models doing more silent thinking before acting. Pick by model family preference; the form factor is similar.
Neither. Both start at $20/mo.
Anthropic's terminal coding agent. It sits in the coding agents category, and ships in 4 tested stacks here.
OpenAI's coding agent: CLI + autonomous cloud PRs. It sits in the coding agents category, and ships in 1 tested stack here.
They are alternatives at the same step, so most stacks pick one or the other. No aistack.sh stack uses both today, though nothing prevents a custom workflow.
Beyond each other, Claude Code's closest alternatives are Cursor. Codex's closest alternatives are Cursor.
