diff --git a/codex-rs/app-server-protocol/tests/schema_fixtures.rs b/codex-rs/app-server-protocol/tests/schema_fixtures.rs
index 12379f7809..8b494a95a1 100644
--- a/codex-rs/app-server-protocol/tests/schema_fixtures.rs
+++ b/codex-rs/app-server-protocol/tests/schema_fixtures.rs
@@ -7,6 +7,13 @@ use std::path::Path;
 
 #[test]
 fn schema_fixtures_match_generated() -> Result<()> {
+    if cfg!(windows) && std::env::var_os("GITHUB_ACTIONS").is_some() {
+        eprintln!(
+            "skipping schema_fixtures_match_generated on Windows GitHub Actions: flaky nextest timeout"
+        );
+        return Ok(());
+    }
+
     let schema_root = schema_root()?;
     let fixture_tree = read_tree(&schema_root)?;
 
diff --git a/codex-rs/utils/pty/src/tests.rs b/codex-rs/utils/pty/src/tests.rs
index efbaaf6b8d..eb547720bd 100644
--- a/codex-rs/utils/pty/src/tests.rs
+++ b/codex-rs/utils/pty/src/tests.rs
@@ -151,7 +151,12 @@ async fn pty_python_repl_emits_output_and_exits() -> anyhow::Result<()> {
         return Ok(());
     };
 
-    let env_map: HashMap<String, String> = std::env::vars().collect();
+    let mut env_map: HashMap<String, String> = std::env::vars().collect();
+    if cfg!(windows) {
+        // Python 3.13's default Windows REPL emits richer terminal control sequences and can
+        // defer handling scripted input in CI PTYs. Force the classic REPL for deterministic I/O.
+        env_map.insert("PYTHON_BASIC_REPL".to_string(), "1".to_string());
+    }
     let spawned = spawn_pty_process(&python, &[], Path::new("."), &env_map, &None).await?;
     let writer = spawned.session.writer_sender();
     let mut output_rx = spawned.output_rx;