Buildkite vs GitHub Actions with compiler.dev runners

Buildkite splits CI in two: it hosts the dashboard and orchestration, and your jobs run on agents that you operate or rent from Buildkite. GitHub Actions bundles the control plane and the runners. If you run huge monorepos or need strict control over where code builds, Buildkite is a serious tool. If you mostly want faster builds on GitHub, a faster runner is a much smaller change. This page compares them and says where Buildkite wins.

What Buildkite is and how it charges

You install the Buildkite agent on machines you control (Kubernetes, EC2, bare metal), and the agent polls Buildkite for work. Your source code and secrets stay on your infrastructure; Buildkite sees metadata and logs. Buildkite also sells hosted agents if you do not want to run fleets.

From its pricing page (checked October 2026):

• Free: $0, up to 5 users, 10 concurrent jobs, 2,000 Linux vCPU minutes a month, Small Linux hosted agents only.
• Pro: $30 per active user per month, 4,000 Linux vCPU minutes included, 10 concurrent agents included then $3.50 per agent a month, macOS hosted agents pay as you go.
• Enterprise: custom.

Hosted Linux agents cost $0.004 per vCPU minute, billed per second: Small (2 vCPU, 4 GB) $0.008, Medium (4 vCPU, 16 GB) $0.016, Large (8 vCPU, 32 GB) $0.032 per minute. Hosted macOS is $0.02 per vCPU minute, so M4 Medium (6 vCPU) is $0.12 per minute.

The per-user fee is the big difference from Actions. Cost grows with headcount as well as minutes, and it applies even if you run every job on your own hardware.

Side by side

Hosted agent rates differ in RAM as well as price, so compare on your own workload.

Where Buildkite is genuinely better

• The agent model at scale. Thousands of agents on your own autoscaling fleet, with queues, agent tags and priorities, is what Buildkite was designed for. Actions can scale self-hosted runners too, but you build more of the plumbing.
• Dynamic pipelines. A step can run a script that prints more YAML, uploaded with buildkite-agent pipeline upload. For monorepos that decide at runtime what to build, this is cleaner than Actions' static workflows plus path filters.
• Security posture. Code never leaves your network. Regulated teams value that.
• Test analytics. Test execution data is a metered part of its plans (250k a month free, 1M on Pro).

The case for GitHub Actions on faster runners

Most teams are not at the scale where Buildkite's model pays off. They want PR checks, merge queue, reusable actions and no fleet to babysit. With compiler.dev you change runs-on and get 8 vCPU / 16 GB machines, a fresh VM per job, at $0.012 per minute. GitHub's own 8-core larger runner is $0.022.

In our benchmarks (full CI runs, 10 test shards, real databases, 8 October 2026), the Go + React + Postgres stack with go test -race went from 6m13s to 2m42s versus GitHub-hosted runners, and the Remix + Drizzle stack from 3m07s to 1m18s. We have not benchmarked against Buildkite agents; a well-sized self-managed fleet may match us.

If you already run your own fleet, see self-hosted vs GitHub-hosted runners for the tradeoffs, and for large repos read the monorepo guide. Rates are on the pricing page.

Migration sketch

A Buildkite pipeline with parallel test shards:

steps:
  - label: ":jest: tests"
    command: npm ci && npx jest --shard=$((BUILDKITE_PARALLEL_JOB+1))/4
    parallelism: 4
    agents:
      queue: linux-large
    plugins:
      - docker#v5.11.0:
          image: node:20
  - wait
  - label: "deploy"
    command: ./deploy.sh
    branches: main

The GitHub Actions version:

name: ci
on: [push, pull_request]
jobs:
  test:
    runs-on: [self-hosted, Linux, compiler-ci]
    strategy:
      matrix:
        shard: [1, 2, 3, 4]
    container: node:20
    steps:
      - uses: actions/checkout@v4
      - run: npm ci && npx jest --shard=${{ matrix.shard }}/4
  deploy:
    needs: test
    if: github.ref == 'refs/heads/main'
    runs-on: [self-hosted, Linux, compiler-ci]
    steps:
      - uses: actions/checkout@v4
      - run: ./deploy.sh

What does not map one to one:

1. Agent queues and tags become runs-on labels.
2. Dynamic pipeline upload becomes a setup job that outputs a matrix as JSON, then fromJSON in a later job.
3. Agent hooks (environment, pre-command) become composite actions or workflow steps.
4. Per-pipeline secrets move to GitHub environments.

Install the GitHub App to try the runner side first.

FAQ

Is Buildkite free?

There is a free plan with limits (5 users, 10 concurrent jobs, 2,000 Linux vCPU minutes a month, checked October 2026). Larger teams pay $30 per active user per month on Pro.

Is Buildkite faster than GitHub Actions?

Speed comes from machine size and caching, not the product. Buildkite lets you pick any hardware you run; Actions lets you pick a runner provider.

Can Buildkite run on GitHub repositories?

Yes, it is a common setup. The difference is that checks come from Buildkite rather than Actions.

Does Buildkite charge for self-hosted agents?

The agent software has no per-minute charge, but the plan fees and per-user pricing still apply. Check the current pricing page for your tier.