diff --git a/handler.go b/handler.go
index 11f1f21..57da7fe 100644
--- a/handler.go
+++ b/handler.go
@@ -106,7 +106,8 @@ func handleChatCompletions(w http.ResponseWriter, r *http.Request) {
 	anthropicReq := ConvertOpenAIRequest(&req)
 	anthropicReq.Stream = true // Always stream from upstream for reliability
 
-	log.Printf("[debug] Sending to upstream %s, model=%s", config.UpstreamURL, req.Model)
+	reqBody, _ := json.Marshal(anthropicReq)
+	log.Printf("[debug] Sending to upstream %s, model=%s, body=%s", config.UpstreamURL, req.Model, string(reqBody))
 
 	// Proxy to upstream (always streaming)
 	resp, err := proxyToUpstream(anthropicReq, apiKey, sessionID, true)