T3 Code FAQ
Straight answers on cost, requirements, privacy, platform support and how T3 Code relates to Create T3 App, Codex and Cursor.
The questions people actually ask, answered without hedging.
Cost and licensing#
Is T3 Code free?#
Yes. T3 Code is open source under the MIT license with no paid tier, no subscription, and no account to create. You pay only for the coding agent behind it — your existing OpenAI, Anthropic or Cursor subscription, or per-token API usage on your own key.
Is there a T3 Code subscription or pricing plan?#
No. There's no commercial tier and nothing to buy from T3 Code itself.
Then what does it cost to run?#
Whatever your provider charges. Two things worth knowing: agentic runs consume far more tokens than chat, because the agent reads a lot of code before writing any. And running three agents in parallel costs roughly three times as much as running one.
Can I use T3 Code commercially?#
The MIT license permits commercial use. Your provider's terms are a separate question — check those for your own agent subscription.
What it is#
What is T3 Code?#
A minimal web and desktop GUI for coding agents. It gives Codex, Claude Code, Cursor and OpenCode a graphical workspace with persistent threads, git worktree isolation, a diff viewer and a one-click pull request flow.
Is T3 Code an AI model?#
No. It has no model of its own. It drives agent CLIs you install and authenticate yourself.
Is T3 Code the same as Create T3 App?#
No, and this is the most common mix-up. Create T3 App scaffolds full-stack TypeScript projects (Next.js, tRPC, Prisma). T3 Code is a GUI for AI coding agents. Same naming lineage, unrelated tools.
Who makes T3 Code?#
Ping Labs — Theo (t3.gg) and the developer Julius. The repository is pingdotgg/t3code.
Is T3 Code an IDE?#
No. There's no code editor. It's a workspace for delegating to agents and reviewing what they produce. Most people run it alongside their editor. T3 Code vs Cursor →
Requirements#
What do I need to run T3 Code?#
A supported OS (Windows, macOS or Linux), git, and at least one provider CLI installed and authenticated. The npx route additionally needs Node.js; the desktop apps bundle their own runtime.
Do I need Codex specifically?#
No, but you need at least one of Codex, Claude Code, Cursor or OpenCode. Codex has the most mature integration. Providers →
What Node.js version?#
For the npx route, a current LTS or newer. For remote environments launched over SSH, specifically ^22.16 || ^23.11 || >=24.10.
Does T3 Code work on Windows and Linux?#
Yes, all three platforms. Linux gets an AUR package and an AppImage; npx t3 works anywhere Node runs. Install guides →
Is there a mobile app?#
No native app. The web interface works in a mobile browser connected to a server on your computer, and you can add it to your home screen. Mobile guide →
Privacy and security#
Does T3 Code send my code anywhere?#
Not to any T3-operated server. The server runs locally on your machine; your code goes only to your model provider through your provider CLI, using your credentials — exactly as it would from a terminal.
Does T3 Code store my API keys?#
No. Authentication belongs entirely to the provider CLI, which stores credentials wherever it normally does. T3 Code launches it as a subprocess. Architecture →
Is it safe to expose T3 Code to the internet?#
No. It can run arbitrary commands and modify files in your repositories. Bind it to a private address such as a Tailscale IP, or use an SSH tunnel, and treat pairing tokens as passwords. Remote access →
What's the difference between Full Access and Supervised mode?#
Full Access, the default, runs commands and edits files with no prompts. Supervised asks before each one. Neither sandboxes the agent — Supervised adds approvals, not restrictions. Runtime modes →
Using it#
Can I run several agents at once?#
Yes, that's the main draw. Each thread can get its own git worktree, so several agents work on separate branches in separate directories simultaneously. Worktrees →
Can I switch models mid-conversation?#
Yes, within a workspace thread, without losing accumulated context.
Can I use it from another computer or a phone?#
Yes. Run npx t3 serve on the host and connect from elsewhere via a pairing URL or QR code, ideally over Tailscale. Remote access →
What port does it use?#
3773 by default. Configuration →
Can I undo what an agent did?#
Yes. T3 Code checkpoints during a thread, and everything is backed by git, so ordinary git recovery also works.
Stability#
Is T3 Code production ready?#
Not by its own description — it says very early stage with expected bugs, and ships nightly builds. It's usable daily, but pin a version if you need reproducibility. Updates →
Why does it break after I update?#
Usually version skew with the provider CLI. Update both together; that resolves most of it. Troubleshooting →
Where do I get help?#
The Discord for live discussion, and GitHub issues for bugs. Include your T3 Code version, provider CLI version, OS and terminal output.
This site#
Is this the official T3 Code documentation?#
No. This is an independent community reference. The official sources are the documentation site, the repository and the Discord. We're not affiliated with Ping Labs or t3.gg.
How current is it?#
Each page shows when it was last checked against the repository. Given nightly releases, verify anything critical against the official sources before depending on it.