diff --git a/providers/openrouter/language_model_hooks.go b/providers/openrouter/language_model_hooks.go
index fb69565ac57730cc7e323f4e9036849bc5cbd39a..5ae579d3ddb3fb226c62717f225b840807210b42 100644
--- a/providers/openrouter/language_model_hooks.go
+++ b/providers/openrouter/language_model_hooks.go
@@ -841,12 +841,14 @@ func languageModelToPrompt(prompt fantasy.Prompt, _, model string) ([]openaisdk.
 								Index:   inx,
 							})
 						}
-						reasoningDetails = append(reasoningDetails, ReasoningDetail{
-							Type:   "reasoning.encrypted",
-							Format: "openai-responses-v1",
-							Data:   *metadata.EncryptedContent,
-							ID:     metadata.ItemID,
-						})
+						if metadata.EncryptedContent != nil {
+							reasoningDetails = append(reasoningDetails, ReasoningDetail{
+								Type:   "reasoning.encrypted",
+								Format: "openai-responses-v1",
+								Data:   *metadata.EncryptedContent,
+								ID:     metadata.ItemID,
+							})
+						}
 						data, _ := json.Marshal(reasoningDetails)
 						reasoningDetailsMap := []map[string]any{}
 						_ = json.Unmarshal(data, &reasoningDetailsMap)
@@ -877,12 +879,14 @@ func languageModelToPrompt(prompt fantasy.Prompt, _, model string) ([]openaisdk.
 								Index:   inx,
 							})
 						}
-						reasoningDetails = append(reasoningDetails, ReasoningDetail{
-							Type:   "reasoning.encrypted",
-							Format: "xai-responses-v1",
-							Data:   *metadata.EncryptedContent,
-							ID:     metadata.ItemID,
-						})
+						if metadata.EncryptedContent != nil {
+							reasoningDetails = append(reasoningDetails, ReasoningDetail{
+								Type:   "reasoning.encrypted",
+								Format: "xai-responses-v1",
+								Data:   *metadata.EncryptedContent,
+								ID:     metadata.ItemID,
+							})
+						}
 						data, _ := json.Marshal(reasoningDetails)
 						reasoningDetailsMap := []map[string]any{}
 						_ = json.Unmarshal(data, &reasoningDetailsMap)
diff --git a/providers/vercel/language_model_hooks.go b/providers/vercel/language_model_hooks.go
index d243e57f65d982b9d7739aeda1f1a6addbe4f868..ef3d5cf63bbbfef17123a31d496b5d3156499a83 100644
--- a/providers/vercel/language_model_hooks.go
+++ b/providers/vercel/language_model_hooks.go
@@ -874,12 +874,14 @@ func languageModelToPrompt(prompt fantasy.Prompt, _, model string) ([]openaisdk.
 								Index:   inx,
 							})
 						}
-						reasoningDetails = append(reasoningDetails, ReasoningDetail{
-							Type:   "reasoning.encrypted",
-							Format: "openai-responses-v1",
-							Data:   *metadata.EncryptedContent,
-							ID:     metadata.ItemID,
-						})
+						if metadata.EncryptedContent != nil {
+							reasoningDetails = append(reasoningDetails, ReasoningDetail{
+								Type:   "reasoning.encrypted",
+								Format: "openai-responses-v1",
+								Data:   *metadata.EncryptedContent,
+								ID:     metadata.ItemID,
+							})
+						}
 						data, _ := json.Marshal(reasoningDetails)
 						reasoningDetailsMap := []map[string]any{}
 						_ = json.Unmarshal(data, &reasoningDetailsMap)