Pricing: Freemium — from Free
Best for: Programming & Code
About
OpenAI's open-source terminal coding agent — reads, edits, and runs code directly in a local sandbox, driven by natural-language instructions.
In-Depth Review
Codex CLI is OpenAI's open-source command-line coding agent, designed to work directly in a developer's local terminal and file system rather than a hosted IDE.
Core Capabilities
Local Sandbox Execution Runs in a sandboxed environment on the developer's own machine, reading and editing files and executing shell commands (tests, builds, linters) with configurable approval levels.
Natural-Language Task Execution Developers describe a task in plain English ("add input validation to the signup form and add tests") and Codex CLI plans the changes, edits the relevant files, and runs tests to verify.
Approval Modes Ranges from fully autonomous execution to step-by-step confirmation, letting teams tune the agent's autonomy to their risk tolerance.
Git-Aware Workflow Understands the current repository's diff and history, and can prepare commits and PR descriptions summarizing its changes.
Positioning
Competes directly with Claude Code and Cursor's agent mode as a terminal-native, model-agnostic-adjacent coding agent from OpenAI.
Pricing
Free and open source; requires an OpenAI API key or ChatGPT Plus/Pro/Team account for model access.
Pricing
Freemium — from Free
Capabilities
Technical
- API Available
- Yes
- Languages
- Multiple programming languages
- Model
- GPT-5 family (code-optimized)
Categories
Pros & Cons
Pros
- Free tier available
- API available for developers
Cons
- Paid plans required for full access
- Limited to English
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Frequently Asked Questions
- Is OpenAI Codex CLI free to use?
- OpenAI Codex CLI offers a free tier. Paid plans start from Free.
- What can OpenAI Codex CLI do?
- OpenAI Codex CLI supports coding-agent, terminal-native, code-editing, test-execution. OpenAI's open-source terminal coding agent — reads, edits, and runs code directly in a local sandbox, driven by natural-language instructions.
- Is OpenAI Codex CLI good for programming & code?
- Yes, OpenAI Codex CLI is well-suited for programming & code. OpenAI's open-source terminal coding agent — reads, edits, and runs code directly in a local sandbox, driven by natural-language instructions.
- Does OpenAI Codex CLI have an API?
- Yes, OpenAI Codex CLI has a public API available for developers.
- What languages does OpenAI Codex CLI support?
- OpenAI Codex CLI primarily supports English.
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