diff --git a/src/xAI.Tests/SanityChecks.cs b/src/xAI.Tests/SanityChecks.cs
index 3540cea..aaf3ad0 100644
--- a/src/xAI.Tests/SanityChecks.cs
+++ b/src/xAI.Tests/SanityChecks.cs
@@ -255,6 +255,7 @@ void AssertIntegrationTest(ChatResponse response, Func<int> getDateCalls)
         Assert.NotNull(response);
         Assert.NotNull(response.ModelId);
         Assert.NotEmpty(response.Messages);
+        Assert.NotNull(response.Usage);
 
         // Verify client-side tool was invoked
         Assert.True(getDateCalls() >= 1);
diff --git a/src/xAI/GrokChatClient.cs b/src/xAI/GrokChatClient.cs
index 27d5ed2..04694e1 100644
--- a/src/xAI/GrokChatClient.cs
+++ b/src/xAI/GrokChatClient.cs
@@ -94,8 +94,10 @@ async IAsyncEnumerable<ChatResponseUpdate> CompleteChatStreamingCore(IEnumerable
 
                 ((List<AIContent>)update.Contents).AddRange(output.Delta.ToolCalls.AsContents(text, citations));
 
-                if (update.Contents.Any())
-                    yield return update;
+                if (MapToUsage(chunk.Usage) is { } usage)
+                    update.Contents.Add(new UsageContent(usage) { RawRepresentation = chunk.Usage });
+
+                yield return update;
             }
         }
     }
@@ -277,6 +279,8 @@ codeResult.RawRepresentation is ToolCall codeToolCall &&
     {
         InputTokenCount = usage.PromptTokens,
         OutputTokenCount = usage.CompletionTokens,
+        CachedInputTokenCount = usage.CachedPromptTextTokens,
+        ReasoningTokenCount = usage.ReasoningTokens,
         TotalTokenCount = usage.TotalTokens
     };