diff --git a/lib/ai/providers/gemini-image.ts b/lib/ai/providers/gemini-image.ts
index 04f021239..d2e1c70f2 100644
--- a/lib/ai/providers/gemini-image.ts
+++ b/lib/ai/providers/gemini-image.ts
@@ -791,6 +791,9 @@ async function sendGeminiRequest(
     const resolvedAspectRatio = inferredAspectRatio || requestedAspectRatio;
     requestBody.size = resolveGrsaiGptImageSize(resolvedAspectRatio, imageParams?.imageSize);
     requestBody.shutProgress = false;
+    logger.debug(
+      `${apiLogPrefix} GPT image payload mapping: requestedAspectRatio=${requestedAspectRatio}, resolvedAspectRatio=${resolvedAspectRatio}, imageSize=${imageParams?.imageSize || "2K"}, resolvedSize=${requestBody.size}`
+    );
     if (inferredAspectRatio) {
       logger.debug(`${apiLogPrefix} Inferred reference aspect ratio: ${inferredAspectRatio}`);
     }