diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index e150972d1..9cbf7be9f 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- Fixed `omp update` aborting with `npm error EEXIST` on standalone binary installs whose directory coincides with the global npm/bun bin dir (for example `npm prefix -g` set to `~/.local`, which the installer also targets). The install-target resolver classified the binary as npm/bun-managed from directory containment alone, so `npm install -g` tried to replace a regular file its symlink step would clobber; it now treats a plain executable (not a symlink) in a package-manager bin dir as the standalone binary and self-updates it in place ([#6527](https://github.com/can1357/oh-my-pi/pull/6527) by [@am423](https://github.com/am423)).
+
 ## [17.1.2] - 2026-07-24
 
 ### Added
diff --git a/packages/coding-agent/src/cli/update-cli.ts b/packages/coding-agent/src/cli/update-cli.ts
index 59cfdfbf2..82796901e 100644
--- a/packages/coding-agent/src/cli/update-cli.ts
+++ b/packages/coding-agent/src/cli/update-cli.ts
@@ -209,6 +209,13 @@ interface UpdateMethodResolutionOptions {
 	miseBinDirs?: readonly string[];
 	miseDataDir?: string;
 	npmBinDir?: string;
+	/**
+	 * Whether the resolved omp path is a plain file (the standalone binary)
+	 * rather than a package-manager symlink. Stops a binary install from being
+	 * misrouted to npm/bun when the global bin dir overlaps the installer's
+	 * target directory.
+	 */
+	ompIsRegularFile?: boolean;
 }
 
 type UpdateTarget =
@@ -223,15 +230,22 @@ function resolveUpdateMethod(
 	bunBinDir: string | undefined,
 	options: UpdateMethodResolutionOptions = {},
 ): UpdateMethod {
-	const { homebrewPrefix, miseBinDirs = [], miseDataDir, npmBinDir } = options;
+	const { homebrewPrefix, miseBinDirs = [], miseDataDir, npmBinDir, ompIsRegularFile = false } = options;
 	const launcherExtension = path.extname(ompPath).toLowerCase();
 	const isWindowsScriptLauncher =
 		launcherExtension === ".cmd" || launcherExtension === ".ps1" || launcherExtension === ".bat";
 	if (homebrewPrefix && isPathInDirectory(ompPath, path.join(homebrewPrefix, "bin"))) return "brew";
 	if (miseBinDirs.some(dir => isPathInDirectory(ompPath, dir))) return "mise";
 	if (miseDataDir && isPathInDirectory(ompPath, path.join(miseDataDir, "shims"))) return "mise";
-	if (bunBinDir && isPathInDirectory(ompPath, bunBinDir)) return "bun";
-	if ((npmBinDir && isPathInDirectory(ompPath, npmBinDir)) || isWindowsScriptLauncher) return "npm";
+	// A plain executable file in a package-manager bin dir is the standalone
+	// binary the installer placed there, not an npm/bun-managed install (those
+	// symlink into node_modules). When the global bin dir overlaps the
+	// installer's default (~/.local/bin), classifying by directory alone routes
+	// a binary install through npm/bun, whose reinstall then collides with the
+	// existing file (npm EEXIST). Fall through to binary replacement instead.
+	if (bunBinDir && isPathInDirectory(ompPath, bunBinDir) && !ompIsRegularFile) return "bun";
+	if ((npmBinDir && isPathInDirectory(ompPath, npmBinDir) && !ompIsRegularFile) || isWindowsScriptLauncher)
+		return "npm";
 	return "binary";
 }
 
@@ -252,7 +266,22 @@ async function resolveUpdateTarget(): Promise<UpdateTarget> {
 	const ompPath = resolveOmpPath();
 
 	if (ompPath) {
-		const method = resolveUpdateMethod(ompPath, bunBinDir, { homebrewPrefix, miseBinDirs, miseDataDir, npmBinDir });
+		// Package-manager installs symlink the bin entry into node_modules; the
+		// standalone installer writes a plain executable. When the global bin dir
+		// overlaps the installer's default (~/.local/bin), that file type — not
+		// directory containment — distinguishes a binary install from npm/bun.
+		let ompIsRegularFile = false;
+		try {
+			const stat = fs.lstatSync(ompPath);
+			ompIsRegularFile = stat.isFile() && !stat.isSymbolicLink();
+		} catch {}
+		const method = resolveUpdateMethod(ompPath, bunBinDir, {
+			homebrewPrefix,
+			miseBinDirs,
+			miseDataDir,
+			npmBinDir,
+			ompIsRegularFile,
+		});
 		if (method === "binary") return { method, path: ompPath };
 		return { method };
 	}
diff --git a/packages/coding-agent/test/update-cli.test.ts b/packages/coding-agent/test/update-cli.test.ts
index 99f93c299..7d25ad0ac 100644
--- a/packages/coding-agent/test/update-cli.test.ts
+++ b/packages/coding-agent/test/update-cli.test.ts
@@ -90,6 +90,36 @@ describe("update-cli install target detection", () => {
 		expect(method).toBe("npm");
 	});
 
+	it("uses binary update when a plain file in the npm global bin dir is the standalone binary, not an npm symlink", () => {
+		// Regression: with `npm prefix -g` pointed at the installer's default
+		// (~/.local), directory containment alone misclassified the standalone
+		// binary as npm-managed, so `npm install -g` failed with EEXIST refusing
+		// to overwrite the existing executable.
+		const method = resolveUpdateMethodForTest("/home/u/.local/bin/omp", undefined, {
+			npmBinDir: "/home/u/.local/bin",
+			ompIsRegularFile: true,
+		});
+
+		expect(method).toBe("binary");
+	});
+
+	it("uses binary update when a plain file in the bun global bin dir is the standalone binary", () => {
+		const method = resolveUpdateMethodForTest("/home/u/.local/bin/omp", "/home/u/.local/bin", {
+			ompIsRegularFile: true,
+		});
+
+		expect(method).toBe("binary");
+	});
+
+	it("still uses npm update when the npm global bin entry is a package-manager symlink, not a plain file", () => {
+		const method = resolveUpdateMethodForTest("/home/u/.local/bin/omp", undefined, {
+			npmBinDir: "/home/u/.local/bin",
+			ompIsRegularFile: false,
+		});
+
+		expect(method).toBe("npm");
+	});
+
 	it("uses binary update when prioritized omp is outside bun global bin", () => {
 		const method = resolveUpdateMethodForTest("/Users/test/.local/bin/omp", "/Users/test/.bun/bin");