diff --git a/.changeset/github-profile-types.md b/.changeset/github-profile-types.md
new file mode 100644
index 0000000000..0f112b389d
--- /dev/null
+++ b/.changeset/github-profile-types.md
@@ -0,0 +1,7 @@
+---
+"@better-auth/core": minor
+---
+
+Allow custom GitHub `getUserInfo` callbacks to return public or private API responses without type assertions. `GithubProfile` now uses numeric IDs and counters, nullable profile attributes, and optional account details.
+
+Consumers may need to handle null or omitted fields and use `String(profile.id)` when a string ID is required.
diff --git a/docs/content/docs/authentication/github.mdx b/docs/content/docs/authentication/github.mdx
index 37fc2939d9..d95e91d0da 100644
--- a/docs/content/docs/authentication/github.mdx
+++ b/docs/content/docs/authentication/github.mdx
@@ -72,6 +72,12 @@ That's all! Now you can copy the Client ID and Client Secret of your app!
   If you get an `email_not_found` error, it is most often because either (a) you created a GitHub App and did not grant the "Email addresses: Read-only" permission, or (b) the user has set their primary email to private, in which case `GET /user` returns `email: null`. See [Handling Providers Without Email](/docs/concepts/oauth#handling-providers-without-email) for the recommended `mapProfileToUser` fallback; the user's private addresses are also available via [`/user/emails`](https://docs.github.com/en/rest/users/emails).
 </Callout>
 
+### Custom profile data
+
+Custom `getUserInfo` callbacks can return GitHub's [public or private `GET /user` response](https://docs.github.com/en/rest/users/users#get-the-authenticated-user) as `data`. `GithubProfile` uses numeric IDs and counters and allows nullable profile attributes. `twitter_username`, private account details, and `plan` can be omitted.
+
+When reading profile data, use `String(profile.id)` if you need a string ID, `profile.name ?? profile.login` for a name fallback, and `profile.plan?.name` for an optional plan.
+
 ### Why don't I have a refresh token?
 
 Github doesn't issue refresh tokens for OAuth apps. For regular OAuth apps,
diff --git a/packages/core/src/social-providers/github.test.ts b/packages/core/src/social-providers/github.test.ts
new file mode 100644
index 0000000000..6919772136
--- /dev/null
+++ b/packages/core/src/social-providers/github.test.ts
@@ -0,0 +1,87 @@
+import { assertType, describe, expect, it } from "vitest";
+import type { GithubProfile } from "./github";
+import { github } from "./github";
+
+const publicProfile = {
+	login: "octocat",
+	id: 583231,
+	node_id: "MDQ6VXNlcjU4MzIzMQ==",
+	avatar_url: "https://avatars.githubusercontent.com/u/583231?v=4",
+	gravatar_id: null,
+	url: "https://api.github.com/users/octocat",
+	html_url: "https://github.com/octocat",
+	followers_url: "https://api.github.com/users/octocat/followers",
+	following_url: "https://api.github.com/users/octocat/following{/other_user}",
+	gists_url: "https://api.github.com/users/octocat/gists{/gist_id}",
+	starred_url: "https://api.github.com/users/octocat/starred{/owner}{/repo}",
+	subscriptions_url: "https://api.github.com/users/octocat/subscriptions",
+	organizations_url: "https://api.github.com/users/octocat/orgs",
+	repos_url: "https://api.github.com/users/octocat/repos",
+	events_url: "https://api.github.com/users/octocat/events{/privacy}",
+	received_events_url: "https://api.github.com/users/octocat/received_events",
+	type: "User",
+	site_admin: false,
+	name: null,
+	company: null,
+	blog: null,
+	location: null,
+	email: null,
+	hireable: null,
+	bio: null,
+	public_repos: 8,
+	public_gists: 8,
+	followers: 20,
+	following: 9,
+	created_at: "2011-01-25T18:44:36Z",
+	updated_at: "2026-01-01T00:00:00Z",
+};
+
+const privateProfile = {
+	...publicProfile,
+	private_gists: 81,
+	total_private_repos: 100,
+	owned_private_repos: 100,
+	disk_usage: 10_000,
+	collaborators: 8,
+	two_factor_authentication: true,
+};
+
+/**
+ * @see https://github.com/better-auth/better-auth/issues/11040
+ * @see https://docs.github.com/en/rest/users/users#get-the-authenticated-user
+ */
+describe("github profile", () => {
+	it("accepts public and private API responses", () => {
+		assertType<GithubProfile>(publicProfile);
+		assertType<GithubProfile>(privateProfile);
+		assertType<GithubProfile>({
+			...publicProfile,
+			twitter_username: "octocat",
+		});
+		assertType<GithubProfile>({
+			...privateProfile,
+			twitter_username: null,
+			plan: { name: "Medium", space: 400, private_repos: 20, collaborators: 0 },
+		});
+	});
+
+	it.each([
+		{ kind: "public", profile: publicProfile },
+		{ kind: "private", profile: privateProfile },
+	])("accepts a raw $kind response from getUserInfo", async ({ profile }) => {
+		const provider = github({
+			clientId: "github-app",
+			getUserInfo: async () => ({
+				user: {
+					name: profile.name ?? profile.login,
+					email: profile.email,
+					emailVerified: false,
+				},
+				data: profile,
+			}),
+		});
+
+		const result = await provider.getUserInfo({ accessToken: "access-token" });
+		expect(result?.data).toBe(profile);
+	});
+});
diff --git a/packages/core/src/social-providers/github.ts b/packages/core/src/social-providers/github.ts
index 70e2346517..62634a2cdd 100644
--- a/packages/core/src/social-providers/github.ts
+++ b/packages/core/src/social-providers/github.ts
@@ -10,10 +10,10 @@ import { authorizationCodeRequest } from "../oauth2/validate-authorization-code"
 
 export interface GithubProfile {
 	login: string;
-	id: string;
+	id: number;
 	node_id: string;
 	avatar_url: string;
-	gravatar_id: string;
+	gravatar_id: string | null;
 	url: string;
 	html_url: string;
 	followers_url: string;
@@ -27,31 +27,31 @@ export interface GithubProfile {
 	received_events_url: string;
 	type: string;
 	site_admin: boolean;
-	name: string;
-	company: string;
-	blog: string;
-	location: string;
+	name: string | null;
+	company: string | null;
+	blog: string | null;
+	location: string | null;
 	email: string | null;
-	hireable: boolean;
-	bio: string;
-	twitter_username: string;
-	public_repos: string;
-	public_gists: string;
-	followers: string;
-	following: string;
+	hireable: boolean | null;
+	bio: string | null;
+	twitter_username?: string | null;
+	public_repos: number;
+	public_gists: number;
+	followers: number;
+	following: number;
 	created_at: string;
 	updated_at: string;
-	private_gists: string;
-	total_private_repos: string;
-	owned_private_repos: string;
-	disk_usage: string;
-	collaborators: string;
-	two_factor_authentication: boolean;
-	plan: {
+	private_gists?: number;
+	total_private_repos?: number;
+	owned_private_repos?: number;
+	disk_usage?: number;
+	collaborators?: number;
+	two_factor_authentication?: boolean;
+	plan?: {
 		name: string;
-		space: string;
-		private_repos: string;
-		collaborators: string;
+		space: number;
+		private_repos: number;
+		collaborators: number;
 	};
 }