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Let an AI Agent complete coding tasks on its own in the terminal

You want to hand whole jobs like “fix this bug” or “add this feature” to an Agent and only do the review yourself.

Short answer: For “Let an AI Agent complete coding tasks on its own in the terminal”, Chuzoly recommends Claude Code (Main Agent), OpenAI Codex (Backup Agent) and Aider (Open source / your choice of model).

You get

Coding tasks handed to a terminal Agent, with you only reviewing

  1. Claude CodeMain Agent
  2. OpenAI CodexBackup Agent
  3. AiderOpen source / your choice of model

3 top picks

1

Claude Code

Main Agent
No free planPaid

Reads and writes your whole codebase, runs commands and tests from the terminal.

Free: The Claude Free plan does not include Claude Code

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2

OpenAI Codex

Backup Agent
FreePaid

Comes with ChatGPT plans; usable in the terminal, editor and web.

Free: ChatGPT Free includes Codex in the desktop app (GPT-6 Luna at standard speed, rolling out)

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3

Aider

Open source / your choice of model
FreeOpen source

Open source and free, works with any model, even local ones, so cost is the most predictable.

Free: Open source and free; bring your own model API

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How to combine them

  1. 1

    Write an AGENTS.md / instructions file in the project root: how to run, how to test, code conventions.

  2. 2

    Give the Agent one clear, verifiable task at a time and ask it to run the tests.

  3. 3

    Work on a separate git branch and merge only after review.

How far the free plans go

Aider and Cline are free themselves; you only pay model API fees. Claude Code and Codex need the matching subscriptions (exact allowances to be verified). Partly to be verified

Prices and limits change often. Data checked on 2026-10-28; the official sites are the final word.

Not for

  • Projects with no tests and no version control (hard to roll back when the Agent breaks something)
  • Shipping without ever looking at the code

Also consider

ClineOpen-source VS Code coding Agent; bring your own API key and use any model
CursorAI code editor (based on VS Code) for people with some coding experience

FAQ

Which AI tools are best for “Let an AI Agent complete coding tasks on its own in the terminal”?

Chuzoly's top 3 picks: Claude Code (Main Agent): Reads and writes your whole codebase, runs commands and tests from the terminal. OpenAI Codex (Backup Agent): Comes with ChatGPT plans; usable in the terminal, editor and web. Aider (Open source / your choice of model): Open source and free, works with any model, even local ones, so cost is the most predictable.

Can I do it for free?

Aider and Cline are free themselves; you only pay model API fees. Claude Code and Codex need the matching subscriptions (exact allowances to be verified).

How do I combine these tools?

1. Write an AGENTS.md / instructions file in the project root: how to run, how to test, code conventions. 2. Give the Agent one clear, verifiable task at a time and ask it to run the tests. 3. Work on a separate git branch and merge only after review.

Who is this not for?

Projects with no tests and no version control (hard to roll back when the Agent breaks something); Shipping without ever looking at the code

Related scenarios

Turn an idea into a working web app, with zero coding experienceLovable · Bolt.new · v0 Build a personal portfolio / product landing page in an hourv0 · Claude · Bolt.new You already have a code project and want AI to help you code fasterCursor · GitHub Copilot · Devin Desktop (formerly Windsurf)

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