The system prompt and tools have very little overhead (<2k tokens), making the prefill latency feel noticeably snappier compared to Opencode.
[0] https://www.npmjs.com/package/@mariozechner/pi-coding-agent#...
Now both codex and opencode seem to work.
I (a hobbyist running a small side project for a dollar or two a month in normal usage, so my account is marked as "individual") got hit with a ~$17,000 bill from Google cloud because some combination of key got leaked or my homelab got compromised, and the attacker consumed tens of thousands in gemini usage in only a few hours. It wasn't even the same Google project as for my project, it was another that hasn't seen activity in a year+.
Google refuses to apply any adjustments, their billing specialist even mixed up my account with someone else, refuses to provide further information for why adjustments are being rejected, refuses any escalation, etc. I already filed a complaint with the FTC and NYS attorney General but the rep couldn't care any less.
My gripe is not that the key was potentially leaked or compromised or similar and then I have to pay as a very expensive "you messed up" mistake, it's that they let an api key rack up tens of thousands in maybe 4 hours or so with usage patterns (model selection, generating text vs image, volume of calls, likely different IP and user agent and whatnot). That's just predatory behavior on an account marked as individual/consumer (not a business).
I think Google did finally implement hard limits this month and I need to go and find that setting, but it's useless if, like you say, they have shitty rate limiting and measurement so that you're way over the limit before they stop you.
I am using a 24GB GPU so it might be different in your case, but I doubt it.