From a4cf0f95144025da3b38a797c899d9ded330600b Mon Sep 17 00:00:00 2001
From: 04cb <0x04cb@gmail.com>
Date: Fri, 5 Jun 2026 23:29:09 +0800
Subject: [PATCH] fix(providers): allow dropping default OpenAI image params
 via null extraBody (#4167)

---
 nanobot/providers/image_generation.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/nanobot/providers/image_generation.py b/nanobot/providers/image_generation.py
index a16a17c77..92e2e88eb 100644
--- a/nanobot/providers/image_generation.py
+++ b/nanobot/providers/image_generation.py
@@ -996,6 +996,8 @@ class OpenAIImageGenerationClient(ImageGenerationProvider):
             body["size"] = size
 
         body.update(self.extra_body)
+        # Drop null-valued params so extraBody can opt out of defaults like response_format.
+        body = {key: value for key, value in body.items() if value is not None}
 
         logger.info("OpenAI Images API request: POST {}/images/generations body={}", self.api_base, body)