cto.new is said to be completely free and unlimited for Claude 4.5 / GPT‑5, but the official states they will use your data to train models for profit.
Currently it seems Claude 4.5 is no longer available, but you can use GPT‑5 and Gemini 2.5 Pro
You can directly link Github and other code repositories; overall it’s a completely free AI code agent
In the spirit of mutual assistance, I hope users who use it share at least one invitation code back.