diff --git a/crates/language_models/src/provider/google.rs b/crates/language_models/src/provider/google.rs
index 73ee095c92..b95d94506c 100644
--- a/crates/language_models/src/provider/google.rs
+++ b/crates/language_models/src/provider/google.rs
@@ -685,10 +685,15 @@ fn update_usage(usage: &mut UsageMetadata, new: &UsageMetadata) {
 }
 
 fn convert_usage(usage: &UsageMetadata) -> language_model::TokenUsage {
+    let prompt_tokens = usage.prompt_token_count.unwrap_or(0) as u32;
+    let cached_tokens = usage.cached_content_token_count.unwrap_or(0) as u32;
+    let input_tokens = prompt_tokens - cached_tokens;
+    let output_tokens = usage.candidates_token_count.unwrap_or(0) as u32;
+
     language_model::TokenUsage {
-        input_tokens: usage.prompt_token_count.unwrap_or(0) as u32,
-        output_tokens: usage.candidates_token_count.unwrap_or(0) as u32,
-        cache_read_input_tokens: usage.cached_content_token_count.unwrap_or(0) as u32,
+        input_tokens,
+        output_tokens,
+        cache_read_input_tokens: cached_tokens,
         cache_creation_input_tokens: 0,
     }
 }