Blacksmith is a hosted CI service that runs GitHub Actions jobs on its own runners. You install the blacksmith.sh GitHub App and change one line, runs-on: ubuntu-latest to a tag such as runs-on: blacksmith-4vcpu-ubuntu-2404 . As of November 2026, the Blacksmith docs at docs.blacksmith.sh list Linux x64 and ARM runners from 2 to 32 vCPU, Windows Server 2025 runners, macOS runners at 6 and 12 vCPU, and 3,000 included x64 2 vCPU minutes a month per organization. If your jobs run on Ubuntu 24.04 x64 and price per minute is the deciding number, Sengi runs the same kind of job at $0.001 a minute (Sengi Basic, 2 vCPU), one-sixth of GitHub's $0.006.

This is a how-to reference: where each fact lives in the official Blacksmith documentation, the exact runner tags, the setup steps, how the included minutes are counted, and where Sengi fits for Linux x64 workloads.

Blacksmith runners at a glance (from docs.blacksmith.sh)

The table below summarizes the x64 Ubuntu 24.04 instance types listed on the Instance Types page…