diff --git a/packages/opencode/src/session/message-v2.ts b/packages/opencode/src/session/message-v2.ts
index 04cb15ef8d02..4d2a90a39ca9 100644
--- a/packages/opencode/src/session/message-v2.ts
+++ b/packages/opencode/src/session/message-v2.ts
@@ -971,6 +971,14 @@ export function fromError(
           cause: e,
         },
       ).toObject()
+    case e instanceof DOMException && e.name === "TimeoutError":
+      return new APIError(
+        {
+          message: e.message || "Operation timed out",
+          isRetryable: true,
+        },
+        { cause: e },
+      ).toObject()
     case OutputLengthError.isInstance(e):
       return e
     case LoadAPIKeyError.isInstance(e):
diff --git a/packages/opencode/test/session/message-v2.test.ts b/packages/opencode/test/session/message-v2.test.ts
index 55ae65c56029..7072a86a3395 100644
--- a/packages/opencode/test/session/message-v2.test.ts
+++ b/packages/opencode/test/session/message-v2.test.ts
@@ -950,6 +950,14 @@ describe("session.message-v2.toModelMessage", () => {
 })
 
 describe("session.message-v2.fromError", () => {
+  test("classifies timeout DOMException as retryable APIError", () => {
+    const result = MessageV2.fromError(new DOMException("operation timed out", "TimeoutError"), { providerID })
+
+    expect(MessageV2.APIError.isInstance(result)).toBe(true)
+    expect((result as MessageV2.APIError).data.message).toBe("operation timed out")
+    expect((result as MessageV2.APIError).data.isRetryable).toBe(true)
+  })
+
   test("serializes context_length_exceeded as ContextOverflowError", () => {
     const input = {
       type: "error",