diff --git a/cost.ts b/cost.ts
index 22edc97..da02e0c 100644
--- a/cost.ts
+++ b/cost.ts
@@ -28,7 +28,7 @@ export function calculateCost(model: string, usage?: Usage): number | null {
   if (!usage) return null;
 
   const { prompt_tokens = 0, completion_tokens = 0, prompt_tokens_details = { cached_tokens: 0 } } = usage;
-  const cost = MODEL_COSTS[model] || MODEL_COSTS["default"];
+  const cost = MODEL_COSTS[model.toLowerCase()] || MODEL_COSTS["default"];
 
   let inputCost = 0;
   let cachedCost = 0;
diff --git a/proxy.ts b/proxy.ts
index ef6f063..6d7598f 100644
--- a/proxy.ts
+++ b/proxy.ts
@@ -163,7 +163,7 @@ const server = http.createServer(async (req, res) => {
       timestamp: new Date(),
       request_method: method,
       request_path: path,
-      model: requestJson?.model || "default",
+      model: (requestJson?.model || "default").toLowerCase(),
       completion_tokens: usage.completion_tokens || null,
       prompt_tokens: usage.prompt_tokens || null,
       total_tokens: usage.total_tokens || null,