What is the best free AI coding assistant?

Aider and Cline are open source and free to install, so their cost is the model provider you connect. Cursor's Hobby plan and GitHub Copilot's Free plan are free to start with usage limits.

Claude Code is included in the paid Pro and Max plans. The product page lists no separate free tier for it.

Which coding assistants are open source?

Aider, Cline and OpenAI Codex publish their code under Apache 2.0. Zed publishes its editor under GPL-3.0, with Apache 2.0 components. OpenCode and Kilo publish their code under MIT.

Which coding tools run in the terminal?

Claude Code, Aider and OpenAI Codex are terminal-first. Cline also has a command-line tool, and GitHub Copilot includes the Copilot CLI.

Best AI Coding Assistants in 2026: Top 10 Ranked

The ranking

Top pickClaude Code93.0
Best with a free planCursor92.0
Best open sourceOpenCode87.5

1
Claude Code
Agentic coding from the terminal, IDE, Slack or the web, included in Pro and Max. It has no free tier, and heavier daily use points to the Max plan.
Best for Terminal-first agentic coding inside a Claude plan
Command lineWebSubscription
93.0of 100
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2
Cursor
An AI-first editor with agents, cloud agents and team controls, and a free Hobby plan with limits. It is an editor you switch to, so teams that want to keep their current editor may prefer an extension.
Best for Developers who want an AI-first editor
macOSWindowsLinuxFree plan, paid upgrades
92.0of 100
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3
GitHub Copilot
Works in VS Code, the Copilot CLI and GitHub.com, and can take an issue to a pull request. Usage is metered in AI credits, and it fits best where code already lives on GitHub.
Best for Teams already hosting code on GitHub
WebWindowsmacOSLinuxCommand lineFree plan, paid upgrades
91.5of 100
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4
OpenCode
MIT-licensed agent that runs in a terminal, an IDE or a desktop app, with free models included and any provider's models connectable. Its public repository and session features place it near Cline in this list.
Best for Open-source terminal agent with any model provider
WindowsmacOSLinuxCommand lineFree and open sourceOpen source
87.5of 100
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5
Cline
An Apache 2.0 agent for desktop, IDE, terminal and SDK, with Plan and Act modes and MCP support. Cost depends on the model provider, and its ability to run commands needs careful permission settings.
Best for Open-source agent that works with any model
WindowsmacOSLinuxCommand lineFree and open sourceOpen source
86.5of 100
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6
Kilo
MIT-licensed agent with VS Code and JetBrains extensions, a command-line tool and cloud agents, using 500 or more models at provider prices. Its paid cloud and enterprise tiers are separate from the open-source agent.
Best for Open-source agent across IDE, terminal and cloud
WindowsmacOSLinuxCommand lineFree and open sourceOpen source
85.0of 100
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7
Aider
A terminal tool that commits each AI edit to git and runs lint and test loops after changes. It has no graphical editor, which suits developers who already work in the terminal.
Best for Terminal pair programming with git history
Command lineFree and open sourceOpen source
83.5of 100
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8
OpenAI Codex
An Apache 2.0 terminal agent from OpenAI that runs on the user's computer. The pages checked tie model access to OpenAI sign-in, and it offers no graphical interface.
Best for Open-source terminal agent in the OpenAI ecosystem
Command lineFree and open sourceOpen source
81.0of 100
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9
Kiro
AWS-built agentic IDE and CLI that turns prompts into specs and runs parallel agents. The Free plan includes 50 credits, and usage is metered in credits that vary by model, so cost is harder to predict than a flat plan.
Best for Spec-driven work inside the AWS ecosystem
macOSWindowsLinuxCommand lineFree plan, paid upgrades
80.5of 100
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10
Zed
A fast multiplayer code editor with a free Personal plan and AI through Pro or your own keys. AI is an add-on to the editor, so it ranks below the dedicated coding agents here.
Best for Fast editor with optional AI and real-time collaboration
macOSLinuxWindowsFree plan, paid upgradesOpen source
79.5of 100
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At a glance

Product	Score	Price	Platforms	Interface	Model choice	Commits to git
Claude Code	93.0	Subscription	Command lineWeb	Terminal, IDE, Slack and web	Anthropic models	Not listed
Cursor	92.0	Free plan, paid upgrades	macOSWindowsLinux	AI code editor	Several frontier models	Not listed
GitHub Copilot	91.5	Free plan, paid upgrades	WebWindowsmacOSLinuxCommand line	Editor extension, CLI and GitHub.com	Several models	Not listed
OpenCode	87.5	Free and open source	WindowsmacOSLinuxCommand line	Terminal, IDE and desktop app	Free models or any provider	Not listed
Cline	86.5	Free and open source	WindowsmacOSLinuxCommand line	Desktop app, IDE, CLI and SDK	Any model the user connects	Not listed
Kilo	85.0	Free and open source	WindowsmacOSLinuxCommand line	VS Code, JetBrains, CLI and cloud	500+ models or local models	Not listed
Aider	83.5	Free and open source	Command line	Terminal	Cloud and local models	Automatic commits
OpenAI Codex	81.0	Free and open source	Command line	Terminal	OpenAI models	Not listed
Kiro	80.5	Free plan, paid upgrades	macOSWindowsLinuxCommand line	IDE and CLI	Auto plus several models	Not listed
Zed	79.5	Free plan, paid upgrades	macOSLinuxWindows	Code editor	Hosted models or your own keys	Not listed

How to choose AI coding assistants

Where you work: Editors suit people who want AI inside the screen they already use; terminal agents suit scripted, remote or server work.
Cost and limits: Compare free-tier limits and usage metering, since Claude Code, GitHub Copilot and Cursor each meter usage differently.
Open source: Aider, Cline, OpenAI Codex and Zed publish their source, which helps when you need to audit what an agent does.
Model choice: Cline and Aider accept models from several providers, while the commercial tools here use the models their vendors offer.

What the scores weigh

Agent capability on real code
Cost and usage limits
Model and provider choice
Source openness and licensing
Fit with editor or terminal

Scores are editorial, from 0 to 100, and use these criteria. Full method · Disclosure

About AI coding assistants

Coding assistants fall into three groups. Editors such as Cursor and Zed build AI into the code editor, and GitHub Copilot works across editors, a CLI and GitHub itself. Terminal agents such as Claude Code, Aider and OpenAI Codex run in a shell and act on the local project. Cline sits between the two as an open-source agent that works in a desktop app, an IDE or the terminal.

Cost models split the field too. Claude Code is included in Claude Pro and Max plans. GitHub Copilot and Cursor offer free and paid plans with usage limits. The open-source agents cost whatever the model provider charges. Aider, Cline and OpenAI Codex publish their code under Apache 2.0, and Zed publishes its editor under GPL-3.0, so their behavior can be inspected.

Scores are editorial judgments against the criteria. Agent quality depends on the model behind it and on the codebase, so the ranking relies on features and terms that can be checked on each product's own pages.

Frequently asked questions

What is the best free AI coding assistant?: Aider and Cline are open source and free to install, so their cost is the model provider you connect. Cursor's Hobby plan and GitHub Copilot's Free plan are free to start with usage limits.
Is Claude Code free?: Claude Code is included in the paid Pro and Max plans. The product page lists no separate free tier for it.
Which coding assistants are open source?: Aider, Cline and OpenAI Codex publish their code under Apache 2.0. Zed publishes its editor under GPL-3.0, with Apache 2.0 components. OpenCode and Kilo publish their code under MIT.
Which coding tools run in the terminal?: Claude Code, Aider and OpenAI Codex are terminal-first. Cline also has a command-line tool, and GitHub Copilot includes the Copilot CLI.