diff --git a/src/app/[locale]/dashboard/logs/_components/error-details-dialog/components/SummaryTab.tsx b/src/app/[locale]/dashboard/logs/_components/error-details-dialog/components/SummaryTab.tsx
index 1873d23ce..a4fba2095 100644
--- a/src/app/[locale]/dashboard/logs/_components/error-details-dialog/components/SummaryTab.tsx
+++ b/src/app/[locale]/dashboard/logs/_components/error-details-dialog/components/SummaryTab.tsx
@@ -69,9 +69,11 @@ export function SummaryTab({
     specialSettings && specialSettings.length > 0 ? JSON.stringify(specialSettings, null, 2) : null;
   const isFake200PostStreamFailure =
     typeof errorMessage === "string" && errorMessage.startsWith("FAKE_200_");
+  const fake200Code =
+    isFake200PostStreamFailure && errorMessage ? errorMessage.split(": ")[0] : errorMessage;
   const fake200Reason =
-    isFake200PostStreamFailure && typeof errorMessage === "string"
-      ? t(getFake200ReasonKey(errorMessage, "fake200Reasons"))
+    isFake200PostStreamFailure && fake200Code
+      ? t(getFake200ReasonKey(fake200Code, "fake200Reasons"))
       : null;
 
   return (
diff --git a/src/app/[locale]/dashboard/logs/_components/provider-chain-popover.tsx b/src/app/[locale]/dashboard/logs/_components/provider-chain-popover.tsx
index 585b7836b..4f27ca0ae 100644
--- a/src/app/[locale]/dashboard/logs/_components/provider-chain-popover.tsx
+++ b/src/app/[locale]/dashboard/logs/_components/provider-chain-popover.tsx
@@ -131,9 +131,11 @@ export function ProviderChainPopover({
   const hasFake200PostStreamFailure = chain.some(
     (item) => typeof item.errorMessage === "string" && item.errorMessage.startsWith("FAKE_200_")
   );
-  const fake200CodeForDisplay = chain.find(
-    (item) => typeof item.errorMessage === "string" && item.errorMessage.startsWith("FAKE_200_")
-  )?.errorMessage;
+  const fake200CodeForDisplay = chain
+    .find(
+      (item) => typeof item.errorMessage === "string" && item.errorMessage.startsWith("FAKE_200_")
+    )
+    ?.errorMessage?.split(": ")[0];
 
   // Calculate actual request count (excluding intermediate states)
   const requestCount = chain.filter(isActualRequest).length;
@@ -545,7 +547,7 @@ export function ProviderChainPopover({
                             {t("logs.details.fake200DetectedReason", {
                               reason: t(
                                 getFake200ReasonKey(
-                                  item.errorMessage,
+                                  item.errorMessage.split(": ")[0],
                                   "logs.details.fake200Reasons"
                                 )
                               ),
diff --git a/src/app/v1/_lib/proxy/response-handler.ts b/src/app/v1/_lib/proxy/response-handler.ts
index f0eed673b..b533b240e 100644
--- a/src/app/v1/_lib/proxy/response-handler.ts
+++ b/src/app/v1/_lib/proxy/response-handler.ts
@@ -185,7 +185,7 @@ async function finalizeDeferredStreamingFinalizationIfNeeded(
     } else {
       effectiveStatusCode = 502;
     }
-    errorMessage = detected.code;
+    errorMessage = detected.detail ? `${detected.code}: ${detected.detail}` : detected.code;
   } else if (!streamEndedNormally) {
     effectiveStatusCode = clientAborted ? 499 : 502;
     errorMessage = clientAborted ? "CLIENT_ABORTED" : (abortReason ?? "STREAM_ABORTED");
@@ -330,7 +330,7 @@ async function finalizeDeferredStreamingFinalizationIfNeeded(
       attemptNumber: meta.attemptNumber,
       statusCode: effectiveStatusCode,
       statusCodeInferred,
-      errorMessage: detected.code,
+      errorMessage: detected.detail ? `${detected.code}: ${detected.detail}` : detected.code,
     });
 
     return { effectiveStatusCode, errorMessage, providerIdForPersistence };