diff --git a/apps/web/src/lib/ai-gateway/llm-proxy-helpers.ts b/apps/web/src/lib/ai-gateway/llm-proxy-helpers.ts
index 5a84550be..527063d99 100644
--- a/apps/web/src/lib/ai-gateway/llm-proxy-helpers.ts
+++ b/apps/web/src/lib/ai-gateway/llm-proxy-helpers.ts
@@ -494,7 +494,8 @@ function computeFimMicrodollarCost(usage: FimUsage, provider: ProviderId): numbe
 
 function parseMistralFimUsageFromString(
   response: string,
-  provider: ProviderId
+  provider: ProviderId,
+  statusCode: number
 ): MicrodollarUsageStats {
   const json: MistralFimCompletion = JSON.parse(response);
   const cost_mUsd = computeFimMicrodollarCost(json.usage, provider);
@@ -503,7 +504,7 @@ function parseMistralFimUsageFromString(
     messageId: json.id,
     model: json.model,
     responseContent: json.choices[0]?.text || '',
-    hasError: !json.model,
+    hasError: !json.model || statusCode >= 400,
     inference_provider: provider,
     inputTokens: json.usage.prompt_tokens,
     outputTokens: json.usage.completion_tokens,
@@ -524,7 +525,8 @@ function parseMistralFimUsageFromString(
 async function parseMistralFimUsageFromStream(
   stream: ReadableStream,
   requestSpan: Span | undefined,
-  provider: ProviderId
+  provider: ProviderId,
+  statusCode: number
 ): Promise<MicrodollarUsageStats> {
   requestSpan?.end();
   const streamProcessingSpan = startInactiveSpan({
@@ -539,7 +541,7 @@ async function parseMistralFimUsageFromStream(
   let messageId: string | null = null;
   let model: string | null = null;
   let responseContent = '';
-  let reportedError = false;
+  let reportedError = statusCode >= 400;
   const startedAt = performance.now();
   let firstTokenReceived = false;
   let usage: FimUsage | undefined;
@@ -627,13 +629,21 @@ export function countAndStoreFimUsage(
   const logFileExtension = usageContext.isStreaming ? '.log.resp.sse' : '.log.resp.json';
   debugSaveProxyResponseStream(clonedResponse, logFileExtension);
 
+  const statusCode = usageContext.status_code ?? 0;
   const usageStatsPromise = !clonedResponse.body
     ? Promise.resolve(null)
     : usageContext.isStreaming
-      ? parseMistralFimUsageFromStream(clonedResponse.body, requestSpan, usageContext.provider)
+      ? parseMistralFimUsageFromStream(
+          clonedResponse.body,
+          requestSpan,
+          usageContext.provider,
+          statusCode
+        )
       : clonedResponse
           .text()
-          .then(content => parseMistralFimUsageFromString(content, usageContext.provider));
+          .then(content =>
+            parseMistralFimUsageFromString(content, usageContext.provider, statusCode)
+          );
 
   after(
     usageStatsPromise.then(usageStats => {