diff --git a/nanobot/providers/image_generation.py b/nanobot/providers/image_generation.py
index 1dcdc649a..d0aac7860 100644
--- a/nanobot/providers/image_generation.py
+++ b/nanobot/providers/image_generation.py
@@ -768,6 +768,13 @@ _OPENAI_ASPECT_RATIO_SIZES = {
     "3:4": "1024x1360",
     "4:3": "1360x1024",
 }
+_OPENAI_GPT_IMAGE_ASPECT_RATIO_SIZES = {
+    "1:1": "1024x1024",
+    "16:9": "1536x1024",
+    "9:16": "1024x1536",
+    "3:4": "1024x1536",
+    "4:3": "1536x1024",
+}
 
 
 class OpenAIImageGenerationClient(ImageGenerationProvider):
@@ -825,7 +832,7 @@ class OpenAIImageGenerationClient(ImageGenerationProvider):
             body["response_format"] = "b64_json"
             body["n"] = 1
 
-        size = _openai_size(aspect_ratio, image_size)
+        size = _openai_size(clean_model, aspect_ratio, image_size)
         if size:
             body["size"] = size
 
@@ -976,14 +983,20 @@ class CodexImageGenerationClient(ImageGenerationProvider):
 
 
 def _openai_size(
+    model: str,
     aspect_ratio: str | None,
     image_size: str | None,
 ) -> str:
     """Resolve aspect ratio or image_size to an OpenAI Images API size string."""
     if image_size and "x" in image_size.lower():
         return image_size
-    if aspect_ratio and aspect_ratio in _OPENAI_ASPECT_RATIO_SIZES:
-        return _OPENAI_ASPECT_RATIO_SIZES[aspect_ratio]
+    sizes = (
+        _OPENAI_GPT_IMAGE_ASPECT_RATIO_SIZES
+        if model.startswith("gpt-image")
+        else _OPENAI_ASPECT_RATIO_SIZES
+    )
+    if aspect_ratio and aspect_ratio in sizes:
+        return sizes[aspect_ratio]
     return "1024x1024"
 
 
diff --git a/nanobot/webui/settings_api.py b/nanobot/webui/settings_api.py
index a5ab13c5a..6d43e22c8 100644
--- a/nanobot/webui/settings_api.py
+++ b/nanobot/webui/settings_api.py
@@ -73,12 +73,16 @@ def _mask_secret_hint(secret: str | None) -> str | None:
 def _provider_requires_api_key(spec: Any) -> bool:
     if spec.backend == "azure_openai":
         return True
+    if spec.is_oauth:
+        return False
     if spec.is_local or spec.is_direct:
         return False
     return True
 
 
 def _provider_configured_for_settings(spec: Any, provider_config: Any) -> bool:
+    if spec.is_oauth:
+        return True
     if _provider_requires_api_key(spec):
         return bool(provider_config.api_key)
     return bool(
diff --git a/tests/channels/test_websocket_channel.py b/tests/channels/test_websocket_channel.py
index cc011a244..74a780c80 100644
--- a/tests/channels/test_websocket_channel.py
+++ b/tests/channels/test_websocket_channel.py
@@ -1055,6 +1055,7 @@ async def test_settings_api_returns_safe_subset_and_updates_whitelist(
         }
         assert image_providers["openrouter"]["label"] == "OpenRouter"
         assert image_providers["openrouter"]["configured"] is False
+        assert image_providers["openai_codex"]["configured"] is True
         assert image_providers["gemini"]["label"] == "Gemini"
         assert body["runtime"]["config_path"] == str(config_path)
         workspace_path = body["runtime"]["workspace_path"].replace("\\", "/")
diff --git a/tests/providers/test_image_generation.py b/tests/providers/test_image_generation.py
index 119bbcf05..c8c05c853 100644
--- a/tests/providers/test_image_generation.py
+++ b/tests/providers/test_image_generation.py
@@ -624,6 +624,19 @@ async def test_openai_aspect_ratio_to_size() -> None:
     assert fake.calls[0]["json"]["size"] == "1024x1024"
 
 
+@pytest.mark.asyncio
+async def test_openai_gpt_image_uses_supported_landscape_size() -> None:
+    fake = FakeClient(FakeResponse({"data": [{"b64_json": RAW_B64}]}))
+    client = OpenAIImageGenerationClient(
+        api_key="sk-openai-test",
+        client=fake,  # type: ignore[arg-type]
+    )
+
+    await client.generate(prompt="draw", model="gpt-image-1", aspect_ratio="16:9")
+
+    assert fake.calls[0]["json"]["size"] == "1536x1024"
+
+
 @pytest.mark.asyncio
 async def test_openai_default_size_when_no_aspect_ratio() -> None:
     fake = FakeClient(FakeResponse({"data": [{"b64_json": RAW_B64}]}))