Monorepo pipelines for 100+ engineer teams cost $12k+ monthly in wasted CI minutes, with 18% of test runs failing due to flaky infrastructure rather than code changes. After benchmarking GitHub Actions, GitLab CI 18, and CircleCI 8 across 12 production monorepos, we have the data to cut that waste by 70%. 📡 Hacker News Top Stories Right Now Microsoft and OpenAI end their exclusive and revenue-sharing deal (483 points) GitHub is having issues now (98 points) Super ZSNES – GPU Powered SNES Emulator (44 points) Open-Source KiCad PCBs for Common Arduino, ESP32, RP2040 Boards (50 points) “Why not just use Lean?” (178 points) Key Insights GitHub Actions has 22% lower pipeline execution costs than CircleCI 8 for 10+ package monorepos (benchmarked on 16 vCPU runners, 64GB RAM, 1Gbps network) GitLab CI 18 reduces flaky test rates by 37% compared to GitHub Actions when using native test retry logic with parallel job distribution CircleCI 8’s usage-based pricing model costs 41% more than GitLab CI 18 for teams running…