$48/month for the droplet (could probably be cheaper on Hertzner) and $100/month for OpenAI plan. so ~$150/month but again this could be cheaper with a different VPS and using Terra/Luna.
I also have a claude max plan for coding but like I mentioned in the article coding is still separate from the agents.
The x2 instance has 8gb memory. They go up to x8. And if you don't use it say during a weekend, then you stop it and resume on Monday, not paying for that period