diff --git a/worker/src/lib/HeliconeProxyRequest/handler.ts b/worker/src/lib/HeliconeProxyRequest/handler.ts
index 4fb13515e7..b27e06c734 100644
--- a/worker/src/lib/HeliconeProxyRequest/handler.ts
+++ b/worker/src/lib/HeliconeProxyRequest/handler.ts
@@ -44,8 +44,11 @@ export async function handleProxyRequest(
     ? new ReadableInterceptor(response.body, proxyRequest.isStream)
     : null;
   let body = interceptor ? interceptor.stream : null;
-
+  const model = await proxyRequest.requestWrapper.getJson<{ model?: string }>();
   if (
+    (model.model &&
+      model.model.includes("claude-3") &&
+      proxyRequest.isStream) ||
     proxyRequest.requestWrapper.heliconeHeaders.featureFlags.streamForceFormat
   ) {
     // eslint-disable-next-line @typescript-eslint/no-explicit-any