What GitHub's own pricing page says
GitHub's Copilot plans and pricing page lists "Pull request reviews in GitHub" in its feature comparison table. On the Free plan, that row is marked not included. It appears starting on the Pro plan, priced at US$10 per user per month, and continues on Pro+ and the organization-wide Business and Enterprise plans. There's no way to turn on Copilot's PR review feature for a user without moving that user, or their organization's policy settings, onto a paid tier.
The organization-wide workaround, and its own cost
Copilot Business and Enterprise organizations can extend code review to teammates who don't hold an individual Copilot seat, but that path still runs through paid infrastructure: it requires enabling the org's "premium request paid usage" policy so the organization is billed directly for that usage as metered AI credits, rather than drawing from an individual's included allowance. Either way, someone on the repository is paying a Copilot subscription or metered usage bill before a PR gets reviewed.
What a BYOK Action changes about that math
A GitHub Action that calls a model provider directly doesn't carry a Copilot seat requirement at all, since it isn't a Copilot feature. The repository owner supplies their own Anthropic or OpenAI API key and pays that provider's usage pricing, plus whatever GitHub Actions minutes the workflow consumes. For a small team that's a different cost shape: usage-based against a provider you already control, instead of a per-seat or metered Copilot bill. It also matters for public-fork contributions, where buying every outside contributor a Copilot seat was never realistic in the first place: the workflow has to read the diff through the GitHub API without checking out or executing the fork's code in a job that holds the provider key, the same constraint that applies regardless of which reviewer is doing the calling.
Where this fits with the rest of the comparison
Seat cost is one axis. See BYOK AI code review vs hosted reviewers for the fuller comparison of data path, control, and operational tradeoffs, and does AI code review send your code to a third party for exactly which systems a BYOK Action's diff data passes through.
No Copilot seat required
Private AI PR Reviewer v1.7.0 is a free, source-available GitHub Action for Anthropic or OpenAI. You provide the model API key and pay any provider usage and applicable GitHub Actions costs; the unmodified Action has no integration with a Cody Labs-operated data service and charges no subscription of its own.
Evaluate the reviewer