GitHub Copilot usage API adds BYOK and enterprise custom model reporting

The Copilot usage metrics API now includes bring‑your‑own‑key (BYOK) usage across GitHub Copilot, separating it from Copilot‑hosted model usage. Reports cover two kinds of usage: BYOK and enterprise custom models. The change was announced on the GitHub Blog.

Official: https://github.blog/changelog/2026-11-03-byok-and-enterprise-custom-models-in-the-copilot-usage-api

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