diff --git a/CHANGELOG.md b/CHANGELOG.md
index c541c6a..31391e6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,9 @@ All notable changes to this project will be documented in this file. This change
 
 ## [Unreleased]
 
+### Added (upstream PR #329 sync)
+- Windows console window hiding: CLI process is spawned with explicit PIPE redirects ensuring the JVM sets `CREATE_NO_WINDOW` on Windows — no console window appears in GUI applications. Equivalent to upstream `windowsHide: true` (upstream PR #329).
+
 ### Changed
 - Recommended default model for non-streaming examples is `claude-haiku-4.5` instead of `gpt-5.2` for faster response times
 
diff --git a/src/github/copilot_sdk/process.clj b/src/github/copilot_sdk/process.clj
index 220b76b..251d497 100644
--- a/src/github/copilot_sdk/process.clj
+++ b/src/github/copilot_sdk/process.clj
@@ -68,7 +68,14 @@
       (when github-token
         (.put env-map "COPILOT_SDK_AUTH_TOKEN" github-token)))
 
-    ;; Configure stdio
+    ;; Configure stdio — use explicit PIPE redirects for all three streams.
+    ;; On Windows, the JVM's ProcessImpl sets CREATE_NO_WINDOW when none of the
+    ;; child's stdio handles are inherited from the parent console. By ensuring
+    ;; PIPE (not INHERIT) for stdin, stdout, and stderr, we guarantee no
+    ;; console window appears — equivalent to upstream windowsHide: true (PR #329).
+    (.redirectInput builder ProcessBuilder$Redirect/PIPE)
+    (.redirectOutput builder ProcessBuilder$Redirect/PIPE)
+    (.redirectError builder ProcessBuilder$Redirect/PIPE)
     (.redirectErrorStream builder false)
 
     (let [process (.start builder)