Aider vs OpenAI Codex CLI

In short

• Both: Command line
• Only Aider states: Chat about your code, Agent that edits files, Knows the whole codebase, Runs commands, Reviews pull requests, Choice of models, Self-hosted, API
• Only OpenAI Codex CLI states: VS Code

Aider

Aider is an open-source terminal tool for pair programming with language models and editing code in local repositories.

Plans

Not read from the maker’s page yet.

Prices checked 2026-09-25 on the maker’s page.

Capabilities

• Chat about your code — “Chat modes — Using the code, architect, ask and help chat modes.” source
• Agent that edits files — “Usage — How to use aider to pair program with AI and edit code in your local git repo.” source
• Knows the whole codebase — “Aider makes a map of your entire codebase, which helps it work well in larger projects.” source
• Runs commands — “Automatically lint and test your code every time aider makes changes.” source
• Reviews pull requests — “You can also use aider to review PR branches:” source
• Command line — “Aider is AI pair programming in your terminal.” source
• Choice of models — “In-chat commands — Control aider with in-chat commands like /add, /model, etc.” source
• Self-hosted — “To run the project locally, follow these steps:” source
• API — “Yes. You can script aider via the command line or python.” source

OpenAI Codex CLI

OpenAI's open-source coding agent runs in your terminal to inspect, modify, test, and review code locally.

Plans

Free

Free

• Unlimited public/private repositories
• Dependabot security and version updates
• 2,000 CI/CD minutes/month
• 500MB of Packages storage
• Issues & Projects
• Community support

Team

• $4 USD per user/month

• Access to GitHub Codespaces
• Repository rules
• Multiple reviewers in pull requests
• Draft pull requests
• Code owners
• 3,000 CI/CD minutes/month

Enterprise

• Starting at $21 USD per user/month

• Data residency
• Enterprise Managed Users
• User provisioning through SCIM
• Enterprise Account to centrally manage multiple organizations
• Environment protection rules
• Repository rules

Prices checked 2026-09-25 on the maker’s page.

Capabilities

• VS Code — “If you want Codex in your code editor (VS Code, Cursor, Windsurf), install in your IDE.” source
• Command line — “Codex CLI is a coding agent from OpenAI that runs locally on your computer.” source

Latest updates

• 2026-09-25 0.157.0 (0.157.0)

  Added GPT-6 Sol and Luna with Bedrock support, migration prompts, fullscreen transcripts, selection, fork and import features, and background-server startup.