opencode builds a lot more in, which is better if you dont want to fiddle with config.
A few months back Pi was working with Gemini. But Gemini support has been removed.
Pi also doesn't work with Claude Code subscription (Anthropic counts tokens used with alternate harnesses separately).
So, in practice Pi is displaced.
I like how quick and snappy Pi is, it feels like a minimal harness, just enough to manage the agent and get out of the way. Earlier models also seemed to have an easier time working with the tools, e.g. GPT-OSS-20B is about a year old and had no trouble in Pi.
Things I've added:
1. Built my own AI judge for 'auto' mode that matches my setup.
2. /plan /go for planning and executing.
3. /flow for A-Z setups. That includes planning, executing, testing and shipping.
4. /deep-research a multi fan-out setup for researching a topic.
5. My own sub agents.
6. A TaskCreate/Update/List setup.
7. Monitors.
8. BashOutput / KillShell.
9. Proper notifications with Notify that uses macOS banner and work.
10. Spawn tool that triggers multiple sub agents.
11. A bridge between signal to use Pi remotely.
Yes a lot of these things is something that was already in Claude Code but now I don't have to use Claude Code and I can customize it to fit me exactly.