by OpenAI
OpenAI's coding agent running locally via CLI with autonomous code editing.
Codex CLI is OpenAI's open-source agentic coding tool built in Rust, running directly in your terminal. Powered by GPT-5-Codex (optimized for real-world software engineering), it features a full-screen terminal UI for interactive coding, subagent parallelization, web search, MCP integration, and automated code review.
Refactor the authentication module to use JWT tokens instead of
session cookies. Update all middleware, tests, and documentation.
Create an AGENTS.md file with project-specific instructions that Codex reads automatically.
Automate repeatable workflows with the exec command:
codex exec "Run all tests, fix any failures, then create a PR"
Paste screenshots or design specs for UI-related tasks.
| Parameter | Description |
|---|---|
| temperature | Randomness 0-2 |
| max_tokens | Maximum response length |
| system | System instructions (via AGENTS.md) |
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