Move daily coding into T3 Code to switch between models and harnesses
A developer moved much of his daily coding into T3 Code, the open-source desktop app for running coding agents, because it lets cross-model, cross-harness users pick models freely and fits his existing prompt stack.
Source
@mattlam_ on X · 2026-10-14
Written in our own words. Credit to the original author. Link checked 2026-10-22.
What they did
A developer moved much of his daily coding into T3 Code, the open-source desktop app for running coding agents, because it lets cross-model, cross-harness users pick models freely and fits his existing prompt stack.
Result (as claimed)
Became his main coding app, to his own surprise.
Tools they used
Cost: Claude Code: from $17/mo; OpenAI Codex: free plan, paid from $8/mo.
Set it up
Pick a contained repo or task
Start on a branch or side project where mistakes are cheap.
Install and configure
Set up T3 Code, Claude Code, OpenAI Codex. Read what it can run on your machine and limit permissions where possible.
Run it on a real task
Give it a well-scoped issue and let it work. Review the diff like any pull request.
Add guardrails
Keep tests and CI in the loop, and never let an agent push to main or touch production secrets unattended.
Copy the full setup prompt
Paste into your agent and it will walk you through the setup, asking before anything that sends, posts or spends.
You are helping me set up this AI use case end to end in Claude Code. Goal: Move daily coding into T3 Code to switch between models and harnesses What the original author did: A developer moved much of his daily coding into T3 Code, the open-source desktop app for running coding agents, because it lets cross-model, cross-harness users pick models freely and fits his existing prompt stack. Reported result (as claimed by the author): Became his main coding app, to his own surprise. Source: https://x.com/mattlam_/status/2110479727244800219 Tools they used: T3 Code, Claude Code, OpenAI Codex Category: Dev & ops Please: 1. Ask me 3 short questions about my situation (accounts I have, budget, what I want the output to look like). 2. Propose a step-by-step plan using these tools or cheaper alternatives, with the time and cost of each step. Use official pricing pages; say "check pricing" if unsure. 3. Then do the setup with me one step at a time, waiting for my OK before anything that sends messages, posts publicly, spends money or deletes data. 4. Finish with a checklist to run it again next time.
You are helping me set up this AI use case end to end in Codex. Goal: Move daily coding into T3 Code to switch between models and harnesses What the original author did: A developer moved much of his daily coding into T3 Code, the open-source desktop app for running coding agents, because it lets cross-model, cross-harness users pick models freely and fits his existing prompt stack. Reported result (as claimed by the author): Became his main coding app, to his own surprise. Source: https://x.com/mattlam_/status/2110479727244800219 Tools they used: T3 Code, Claude Code, OpenAI Codex Category: Dev & ops Please: 1. Ask me 3 short questions about my situation (accounts I have, budget, what I want the output to look like). 2. Propose a step-by-step plan using these tools or cheaper alternatives, with the time and cost of each step. Use official pricing pages; say "check pricing" if unsure. 3. Then do the setup with me one step at a time, waiting for my OK before anything that sends messages, posts publicly, spends money or deletes data. 4. Finish with a checklist to run it again next time.
You are helping me set up this AI use case end to end in Grok Bot. Goal: Move daily coding into T3 Code to switch between models and harnesses What the original author did: A developer moved much of his daily coding into T3 Code, the open-source desktop app for running coding agents, because it lets cross-model, cross-harness users pick models freely and fits his existing prompt stack. Reported result (as claimed by the author): Became his main coding app, to his own surprise. Source: https://x.com/mattlam_/status/2110479727244800219 Tools they used: T3 Code, Claude Code, OpenAI Codex Category: Dev & ops Please: 1. Ask me 3 short questions about my situation (accounts I have, budget, what I want the output to look like). 2. Propose a step-by-step plan using these tools or cheaper alternatives, with the time and cost of each step. Use official pricing pages; say "check pricing" if unsure. 3. Then do the setup with me one step at a time, waiting for my OK before anything that sends messages, posts publicly, spends money or deletes data. 4. Finish with a checklist to run it again next time.
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Guides for this use case
How to run multiple coding agents together · How to run Claude Code and Codex in a desktop app (T3 Code, Codex app, Claude Desktop) · How to use Claude Code and Codex together · How to make AI video ads and Reels with agents
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