tl;dr: Pi is a minimalist coding harness with only 4 tools and a sub-1,000-token system prompt, betting that lean context beats bloated orchestration. In Databricks' benchmarks, Pi paired with Opus 4.8 achieved the highest pass-rate at significantly lower cost than Claude Code and Codex, sending ~3x less context per turn. Its extensibility—demonstrated by Shopify building pi-autoresearch as a Pi extension—lets users add complexity only when needed, making it especially suited for local models with smaller context windows.