diff --git a/.changeset/ready-ravens-swim.md b/.changeset/ready-ravens-swim.md
new file mode 100644
index 00000000000..2051b8e5493
--- /dev/null
+++ b/.changeset/ready-ravens-swim.md
@@ -0,0 +1,7 @@
+---
+'@graphql-codegen/cli': patch
+---
+
+fix(graphql-codegen-cli): Don't hang when 0 CPUs are found
+
+Fixes generation when 0 CPUs are returned by os.cpus(), which occurs in sandbox environments.
diff --git a/packages/graphql-codegen-cli/src/codegen.ts b/packages/graphql-codegen-cli/src/codegen.ts
index e44c107486e..b4e32ae82f7 100644
--- a/packages/graphql-codegen-cli/src/codegen.ts
+++ b/packages/graphql-codegen-cli/src/codegen.ts
@@ -423,7 +423,7 @@ export async function executeCodegen(
             };
           });
 
-          return task.newListr(generateTasks, { concurrent: cpus().length });
+          return task.newListr(generateTasks, { concurrent: cpus().length || 1 });
         },
       },
     ],