diff --git a/src/Plugins/BotSharp.Plugin.GoogleAI/Providers/Chat/ChatCompletionProvider.cs b/src/Plugins/BotSharp.Plugin.GoogleAI/Providers/Chat/ChatCompletionProvider.cs
index 4843f7105..626e517ca 100644
--- a/src/Plugins/BotSharp.Plugin.GoogleAI/Providers/Chat/ChatCompletionProvider.cs
+++ b/src/Plugins/BotSharp.Plugin.GoogleAI/Providers/Chat/ChatCompletionProvider.cs
@@ -126,7 +126,8 @@ public async Task<RoleDialogModel> GetChatCompletions(Agent agent, List<RoleDial
                 Prompt = prompt,
                 Provider = Provider,
                 Model = _model,
-                TextInputTokens = response?.UsageMetadata?.PromptTokenCount ?? 0,
+                TextInputTokens = ProviderHelper.GetInputTokens(response?.UsageMetadata),
+                CachedTextInputTokens = ProviderHelper.GetCachedInputTokens(response?.UsageMetadata),
                 TextOutputTokens = ProviderHelper.GetOutputTokens(response?.UsageMetadata)
             });
         }
@@ -183,7 +184,8 @@ public async Task<bool> GetChatCompletionsAsync(Agent agent, List<RoleDialogMode
                 Prompt = prompt,
                 Provider = Provider,
                 Model = _model,
-                TextInputTokens = response?.UsageMetadata?.PromptTokenCount ?? 0,
+                TextInputTokens = ProviderHelper.GetInputTokens(response?.UsageMetadata),
+                CachedTextInputTokens = ProviderHelper.GetCachedInputTokens(response?.UsageMetadata),
                 TextOutputTokens = ProviderHelper.GetOutputTokens(response?.UsageMetadata)
             });
         }
@@ -446,7 +448,8 @@ public async Task<RoleDialogModel> GetChatCompletionsStreamingAsync(Agent agent,
                 Prompt = prompt,
                 Provider = Provider,
                 Model = _model,
-                TextInputTokens = tokenUsage?.PromptTokenCount ?? 0,
+                TextInputTokens = ProviderHelper.GetInputTokens(tokenUsage),
+                CachedTextInputTokens = ProviderHelper.GetCachedInputTokens(tokenUsage),
                 TextOutputTokens = ProviderHelper.GetOutputTokens(tokenUsage)
             });
         }
diff --git a/src/Plugins/BotSharp.Plugin.GoogleAI/Providers/ProviderHelper.cs b/src/Plugins/BotSharp.Plugin.GoogleAI/Providers/ProviderHelper.cs
index 91d38ae09..f1807abca 100644
--- a/src/Plugins/BotSharp.Plugin.GoogleAI/Providers/ProviderHelper.cs
+++ b/src/Plugins/BotSharp.Plugin.GoogleAI/Providers/ProviderHelper.cs
@@ -26,4 +26,18 @@ public static long GetOutputTokens(GenerativeAI.Types.UsageMetadata? usage)
     {
         return (usage?.CandidatesTokenCount ?? 0) + (usage?.ThoughtsTokenCount ?? 0);
     }
+
+    /// <summary>
+    /// Gemini's prompt count includes the tokens served from the context cache,
+    /// which are billed at a separate rate, so they are subtracted here.
+    /// </summary>
+    public static long GetInputTokens(GenerativeAI.Types.UsageMetadata? usage)
+    {
+        return Math.Max((usage?.PromptTokenCount ?? 0) - GetCachedInputTokens(usage), 0);
+    }
+
+    public static long GetCachedInputTokens(GenerativeAI.Types.UsageMetadata? usage)
+    {
+        return usage?.CachedContentTokenCount ?? 0;
+    }
 }
diff --git a/src/Plugins/BotSharp.Plugin.GoogleAI/Providers/Text/TextCompletionProvider.cs b/src/Plugins/BotSharp.Plugin.GoogleAI/Providers/Text/TextCompletionProvider.cs
index 6e5c267dc..6576c80e0 100644
--- a/src/Plugins/BotSharp.Plugin.GoogleAI/Providers/Text/TextCompletionProvider.cs
+++ b/src/Plugins/BotSharp.Plugin.GoogleAI/Providers/Text/TextCompletionProvider.cs
@@ -62,7 +62,8 @@ public async Task<string> GetCompletion(string text, string agentId, string mess
                 Prompt = text,
                 Provider = Provider,
                 Model = _model,
-                TextInputTokens = response?.UsageMetadata?.PromptTokenCount ?? 0,
+                TextInputTokens = ProviderHelper.GetInputTokens(response?.UsageMetadata),
+                CachedTextInputTokens = ProviderHelper.GetCachedInputTokens(response?.UsageMetadata),
                 TextOutputTokens = ProviderHelper.GetOutputTokens(response?.UsageMetadata)
             });
         }
diff --git a/tests/BotSharp.Core.UnitTests/Plugins/GoogleAiUsageTests.cs b/tests/BotSharp.Core.UnitTests/Plugins/GoogleAiUsageTests.cs
index c6142996d..b9ea42aa2 100644
--- a/tests/BotSharp.Core.UnitTests/Plugins/GoogleAiUsageTests.cs
+++ b/tests/BotSharp.Core.UnitTests/Plugins/GoogleAiUsageTests.cs
@@ -20,4 +20,22 @@ public void Output_tokens_without_thinking_are_the_candidates_count()
         Assert.Equal(20, ProviderHelper.GetOutputTokens(new UsageMetadata { CandidatesTokenCount = 20 }));
         Assert.Equal(0, ProviderHelper.GetOutputTokens(null));
     }
+
+    [Fact]
+    public void Cached_tokens_are_not_counted_as_fresh_input()
+    {
+        var usage = new UsageMetadata { PromptTokenCount = 1000, CachedContentTokenCount = 800 };
+
+        Assert.Equal(200, ProviderHelper.GetInputTokens(usage));
+        Assert.Equal(800, ProviderHelper.GetCachedInputTokens(usage));
+    }
+
+    [Fact]
+    public void Input_tokens_without_cache_are_the_prompt_count()
+    {
+        Assert.Equal(50, ProviderHelper.GetInputTokens(new UsageMetadata { PromptTokenCount = 50 }));
+        Assert.Equal(0, ProviderHelper.GetCachedInputTokens(new UsageMetadata { PromptTokenCount = 50 }));
+        Assert.Equal(0, ProviderHelper.GetInputTokens(null));
+        Assert.Equal(0, ProviderHelper.GetCachedInputTokens(null));
+    }
 }