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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