diff --git a/packages/vscode/src/extension.ts b/packages/vscode/src/extension.ts
index 805425a8..d56e92a2 100644
--- a/packages/vscode/src/extension.ts
+++ b/packages/vscode/src/extension.ts
@@ -547,7 +547,7 @@ export async function activate(context: vscode.ExtensionContext) {
       };
 
       const probeTargets: Array<{ label: string; path: string; includeDirectory?: boolean; timeoutMs?: number }> = [
-        { label: 'health', path: '/api/health', includeDirectory: false },
+        { label: 'health', path: '/global/health', includeDirectory: false },
         { label: 'config', path: '/config', includeDirectory: true },
         { label: 'providers', path: '/config/providers', includeDirectory: true },
         // Can be slower on large configs; keep the probe from producing false negatives.
diff --git a/packages/vscode/src/opencode.ts b/packages/vscode/src/opencode.ts
index 4d716d10..98ddafc3 100644
--- a/packages/vscode/src/opencode.ts
+++ b/packages/vscode/src/opencode.ts
@@ -567,8 +567,8 @@ async function waitForReady(
         const controller = new AbortController();
         const timeout = setTimeout(() => controller.abort(), 3000);
 
-        // OpenCode readiness check.
-        const url = new URL(`${baseUrl}/api/health`);
+        // OpenCode readiness check. Use /global/health for OpenCode 1.15.x compatibility.
+        const url = new URL(`${baseUrl}/global/health`);
         const res = await fetch(url.toString(), {
           method: 'GET',
           headers: { Accept: 'application/json', ...authHeaders },
diff --git a/packages/web/server/lib/opencode/lifecycle.js b/packages/web/server/lib/opencode/lifecycle.js
index 69706ba9..94c39edb 100644
--- a/packages/web/server/lib/opencode/lifecycle.js
+++ b/packages/web/server/lib/opencode/lifecycle.js
@@ -13,6 +13,7 @@ const HEALTH_CHECK_MAX_CONSECUTIVE_FAILURES = parsePositiveInt(
 );
 const HEALTH_CHECK_INTERVAL_OVERRIDE_MS = parsePositiveInt(process.env.OPENCHAMBER_OPENCODE_HEALTH_INTERVAL_MS, 0);
 const HEALTH_CHECK_RESULT_CACHE_MS = parsePositiveInt(process.env.OPENCHAMBER_OPENCODE_HEALTH_CACHE_MS, 750);
+const OPENCODE_HEALTH_PATH = '/global/health';
 
 export const createOpenCodeLifecycleRuntime = (deps) => {
   const {
@@ -392,7 +393,7 @@ export const createOpenCodeLifecycleRuntime = (deps) => {
     }
 
     try {
-      const response = await fetch(buildOpenCodeUrl('/api/health', ''), {
+      const response = await fetch(buildOpenCodeUrl(OPENCODE_HEALTH_PATH, ''), {
         method: 'GET',
         headers: {
           Accept: 'application/json',
@@ -417,7 +418,7 @@ export const createOpenCodeLifecycleRuntime = (deps) => {
       const controller = new AbortController();
       const timeout = setTimeout(() => controller.abort(), 3000);
       const base = origin ?? `http://127.0.0.1:${port}`;
-      const response = await fetch(`${base}/api/health`, {
+      const response = await fetch(`${base}${OPENCODE_HEALTH_PATH}`, {
         method: 'GET',
         headers: {
           Accept: 'application/json',
@@ -663,7 +664,7 @@ export const createOpenCodeLifecycleRuntime = (deps) => {
       try {
         const controller = new AbortController();
         timeout = setTimeout(() => controller.abort(), HEALTH_CHECK_TIMEOUT_MS);
-        const response = await fetch(buildOpenCodeUrl('/api/health', ''), {
+        const response = await fetch(buildOpenCodeUrl(OPENCODE_HEALTH_PATH, ''), {
           method: 'GET',
           headers: { Accept: 'application/json', ...getOpenCodeAuthHeaders() },
           signal: controller.signal,
diff --git a/packages/web/server/lib/opencode/network-runtime.js b/packages/web/server/lib/opencode/network-runtime.js
index 896ff431..a9094e46 100644
--- a/packages/web/server/lib/opencode/network-runtime.js
+++ b/packages/web/server/lib/opencode/network-runtime.js
@@ -33,7 +33,7 @@ export const createOpenCodeNetworkRuntime = (deps) => {
       try {
         const controller = new AbortController();
         timeout = setTimeout(() => controller.abort(), 3000);
-        const response = await fetch(`${url.replace(/\/+$/, '')}/api/health`, {
+        const response = await fetch(`${url.replace(/\/+$/, '')}/global/health`, {
           method: 'GET',
           headers: {
             Accept: 'application/json',
diff --git a/packages/web/server/lib/opencode/routes.js b/packages/web/server/lib/opencode/routes.js
index ebcc6eff..2bbe93ca 100644
--- a/packages/web/server/lib/opencode/routes.js
+++ b/packages/web/server/lib/opencode/routes.js
@@ -214,7 +214,7 @@ export const registerOpenCodeRoutes = (app, dependencies) => {
 
   app.get('/api/opencode/health', async (_req, res) => {
     try {
-      const healthResponse = await fetch(buildOpenCodeUrl('/api/health', ''), {
+      const healthResponse = await fetch(buildOpenCodeUrl('/global/health', ''), {
         method: 'GET',
         headers: { Accept: 'application/json', ...getOpenCodeAuthHeaders() },
       });