The Two-Model Coding Stack

The exact $40/mo setup to run Claude Code and Codex side by side, so the right model handles the right job and neither plan ever runs out mid-week.

Two $20 Plans 5-Minute Setup Token-Saving Rules Solo Founder Tested

Run Claude Code and GPT-5.5 in the same terminal so you stop tab switching mid-build

Use Opus 4.7 for design and architecture, GPT-5.5 for the heavy lifting, and stop overpaying for a single Max plan

Apply the token-saving rules so a $40 stack outlasts a $200 plan that fires every prompt at the most expensive model

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Common Questions

Do I need both subscriptions to use this?

Yes, the whole point of the stack is using ChatGPT Plus ($20/mo) for GPT-5.5 inside Codex and Claude Pro ($20/mo) for Claude Code in the terminal. The guide also works if you only have one, but you get the full benefit when both are active.

Do I need to know how to code?

No. The setup is mostly install commands and some terminal basics. The guide walks you through every step. If you get stuck, paste the error into Claude and it will tell you what to do next.

Why not just use one $100 or $200 plan?

Because each model is genuinely best at a different half of the work. Claude Opus 4.7 is the senior architect for design and planning, GPT-5.5 in Codex is the grinder for implementation, and using each for the half they crush costs less and ships more.

Is this actually free?

Yes. The guide is 100% free. No credit card, no upsell. You just need an active ChatGPT Plus and Claude Pro subscription to follow along (those are the $20 plans the guide is built around).

Ready to ditch the $200 plan?

Grab the guide and run Claude Code + Codex on $40/mo.