diff --git a/src/interfaces.ts b/src/interfaces.ts
index 45c6b74..9d717bb 100644
--- a/src/interfaces.ts
+++ b/src/interfaces.ts
@@ -199,14 +199,14 @@ export interface GenerateResponse {
   response?: string
   thinking?: string
   done: boolean
-  done_reason: string
-  context: number[]
-  total_duration: number
-  load_duration: number
-  prompt_eval_count: number
-  prompt_eval_duration: number
-  eval_count: number
-  eval_duration: number
+  done_reason?: string
+  context?: number[]
+  total_duration?: number
+  load_duration?: number
+  prompt_eval_count?: number
+  prompt_eval_duration?: number
+  eval_count?: number
+  eval_duration?: number
   logprobs?: Logprob[]
 
   // Image generation response fields
@@ -220,13 +220,13 @@ export interface ChatResponse {
   created_at: Date
   message: Message
   done: boolean
-  done_reason: string
-  total_duration: number
-  load_duration: number
-  prompt_eval_count: number
-  prompt_eval_duration: number
-  eval_count: number
-  eval_duration: number
+  done_reason?: string
+  total_duration?: number
+  load_duration?: number
+  prompt_eval_count?: number
+  prompt_eval_duration?: number
+  eval_count?: number
+  eval_duration?: number
   logprobs?: Logprob[]
 }