diff --git a/proxy/cache_tracker.go b/proxy/cache_tracker.go
index 582754b..2c07d5a 100644
--- a/proxy/cache_tracker.go
+++ b/proxy/cache_tracker.go
@@ -512,13 +512,9 @@ func computePromptCacheTTLBreakdown(profile *promptCacheProfile, matchedTokens i
 	return cache5m, cache1h
 }
 
-func billedClaudeInputTokens(inputTokens int, usage promptCacheUsage) int {
-	return maxInt(inputTokens-usage.CacheCreationInputTokens-usage.CacheReadInputTokens, 0)
-}
-
 func buildClaudeUsageMap(inputTokens, outputTokens int, usage promptCacheUsage, includeCache bool) map[string]interface{} {
 	result := map[string]interface{}{
-		"input_tokens":  billedClaudeInputTokens(inputTokens, usage),
+		"input_tokens":  inputTokens,
 		"output_tokens": outputTokens,
 	}
 	if !includeCache {
diff --git a/proxy/cache_tracker_test.go b/proxy/cache_tracker_test.go
index aa620c8..f0130f3 100644
--- a/proxy/cache_tracker_test.go
+++ b/proxy/cache_tracker_test.go
@@ -56,8 +56,8 @@ func TestBuildClaudeUsageMapIncludesCacheFields(t *testing.T) {
 
 	m := buildClaudeUsageMap(100, 50, usage, true)
 
-	if got := m["input_tokens"]; got != 50 {
-		t.Fatalf("expected billed input tokens 50, got %#v", got)
+	if got := m["input_tokens"]; got != 100 {
+		t.Fatalf("expected input tokens 100 (no deduction), got %#v", got)
 	}
 	if got := m["cache_creation_input_tokens"]; got != 30 {
 		t.Fatalf("expected cache creation tokens 30, got %#v", got)
diff --git a/proxy/handler.go b/proxy/handler.go
index bfccaf3..904fc07 100644
--- a/proxy/handler.go
+++ b/proxy/handler.go
@@ -1286,7 +1286,7 @@ func (h *Handler) handleClaudeNonStream(w http.ResponseWriter, account *config.A
 	}
 
 	resp := KiroToClaudeResponse(finalContent, responseThinkingContent, includeEmptyThinkingBlock, toolUses, inputTokens, outputTokens, model)
-	resp.Usage.InputTokens = billedClaudeInputTokens(inputTokens, cacheUsage)
+	resp.Usage.InputTokens = inputTokens
 	resp.Usage.CacheCreationInputTokens = cacheUsage.CacheCreationInputTokens
 	resp.Usage.CacheReadInputTokens = cacheUsage.CacheReadInputTokens
 	if cacheProfile != nil {