diff --git a/crates/ml/src/ppo/ppo.rs b/crates/ml/src/ppo/ppo.rs
index 7edb65027..a12fd917d 100644
--- a/crates/ml/src/ppo/ppo.rs
+++ b/crates/ml/src/ppo/ppo.rs
@@ -275,7 +275,7 @@ impl Default for PPOConfig {
             lstm_num_layers: 1,
             lstm_sequence_length: 32,
             accumulation_steps: 1,
-            clip_epsilon_high: None,
+            clip_epsilon_high: Some(0.28), // DAPO asymmetric clipping: [1-0.2, 1+0.28] = [0.8, 1.28]
             mixed_precision: None,
         }
     }