BYOK AI Code Review vs Hosted Reviewers

What “bring your own key” changes

In a BYOK Action, the repository owner selects and pays the model provider. The workflow can run on a GitHub-hosted runner (or an ephemeral, single-purpose self-hosted runner with cleanup guarantees) and call the provider directly. A hosted reviewer normally operates an additional service that receives repository events or code and manages model access for the customer.

Neither architecture is automatically “more secure.” The right choice depends on the controls you need and the operational work you accept.

Choose BYOK when control is the priority

• You want no additional review vendor in the source-code data path.
• You need to choose a specific provider, model, region, or account policy.
• You prefer provider usage pricing over a per-seat reviewer subscription.
• You can maintain a small workflow and review Action updates.
• You want the review configuration versioned with the repository.

Choose hosted when operations are the priority

• You want centralized administration across many repositories.
• You need a vendor dashboard, consolidated billing, usage analytics, or service support.
• You do not want teams to manage provider accounts and GitHub secrets.
• You value managed indexing or cross-repository context enough to accept another processor in the data path.

Questions to ask either vendor

1. Exactly which systems receive source code, metadata, prompts, and responses?
2. What is retained, for how long, and is any data used for model training?
3. Can untrusted pull-request code execute in a job that holds secrets?
4. Where does repository context come from, and can a PR author change it?
5. How are duplicate comments, generated files, large diffs, and provider failures handled?
6. Can you inspect or export the configuration needed to reproduce the review?

The short version of question one

See does AI code review send your code to a third party for exactly which systems this specific Action's diff data passes through.

A specific per-seat cost worth naming

GitHub's own Copilot pricing page lists pull request reviews as unavailable on the Copilot Free plan, only arriving on the paid Pro tier and above. See GitHub Copilot code review requires a paid Copilot plan for what that costs and how a BYOK Action's cost shape compares.