diff --git a/crates/ml/src/trainers/ppo.rs b/crates/ml/src/trainers/ppo.rs
index 84ceef19c..fef6d21ea 100644
--- a/crates/ml/src/trainers/ppo.rs
+++ b/crates/ml/src/trainers/ppo.rs
@@ -305,6 +305,21 @@ impl PpoTrainer {
         config.gae_config.gamma = hyperparams.gamma as f32;
         config.gae_config.lambda = hyperparams.gae_lambda;
 
+        // Auto-detect mixed precision capability based on GPU architecture
+        if device.is_cuda() {
+            match crate::memory_optimization::auto_batch_size::detect_gpu_memory() {
+                Ok((_total, _free, ref name)) => {
+                    let detected = crate::dqn::mixed_precision::detect_from_gpu_name(name);
+                    match &detected {
+                        Some(c) => info!("PPO mixed precision: {:?} enabled (GPU: {})", c.dtype, name),
+                        None => info!("PPO mixed precision: disabled (GPU: {})", name),
+                    }
+                    config.mixed_precision = detected;
+                }
+                Err(_) => {}
+            }
+        }
+
         // Create PPO model with specified device (GPU or CPU)
         let model = PPO::with_device(config, device.clone())?;