fix(tests): swap dall-e to gpt-image-1 after openai deprecation

DALL-E 2 and DALL-E 3 were removed from the OpenAI API on 2026-05-12,
causing e2e image-generation tests to fail with "model does not exist".
Swap all live-API DALL-E references in proxy-backed tests to gpt-image-1
and update the dall-e-2 alias in proxy_server_config.yaml to point at
openai/gpt-image-1 (preserves any historical dall-e-2 callers).

proxy_server_config.yaml

@@ -38,9 +38,9 @@ model_list:
     model_info:
       mode: embedding
       base_model: text-embedding-ada-002
-  - model_name: dall-e-2 # some tests use dall-e-2 which is now deprecated, alias to dall-e-3
+  - model_name: dall-e-2 # dall-e-2 and dall-e-3 were deprecated 2026-05-12; alias to gpt-image-1
     litellm_params:
-      model: openai/dall-e-3
+      model: openai/gpt-image-1
   - model_name: openai-dall-e-3
     litellm_params:
       model: dall-e-3

tests/otel_tests/test_otel.py

@@ -13,7 +13,7 @@ async def generate_key(
     models=[
         "gpt-4",
         "text-embedding-ada-002",
-        "dall-e-2",
+        "gpt-image-1",
         "fake-openai-endpoint",
         "mistral-embed",
     ],

tests/test_health.py

@@ -31,7 +31,7 @@ async def generate_key(session):
     url = "http://0.0.0.0:4000/key/generate"
     headers = {"Authorization": "Bearer sk-1234", "Content-Type": "application/json"}
     data = {
-        "models": ["gpt-4", "text-embedding-ada-002", "dall-e-2"],
+        "models": ["gpt-4", "text-embedding-ada-002", "gpt-image-1"],
         "duration": None,
     }
 

tests/test_keys.py

@@ -62,7 +62,7 @@ async def generate_key(
     i,
     budget=None,
     budget_duration=None,
-    models=["azure-models", "gpt-4", "dall-e-3"],
+    models=["azure-models", "gpt-4", "gpt-image-1"],
     max_parallel_requests: Optional[int] = None,
     user_id: Optional[str] = None,
     team_id: Optional[str] = None,
@@ -235,7 +235,7 @@ async def chat_completion(session, key, model="gpt-4"):
                 pass
 
 
-async def image_generation(session, key, model="dall-e-3"):
+async def image_generation(session, key, model="gpt-image-1"):
     url = "http://0.0.0.0:4000/v1/images/generations"
     headers = {
         "Authorization": f"Bearer {key}",

tests/test_openai_endpoints.py

@@ -23,7 +23,7 @@ async def generate_key(
     models=[
         "gpt-4",
         "text-embedding-ada-002",
-        "dall-e-2",
+        "gpt-image-1",
         "fake-openai-endpoint-2",
         "mistral-embed",
     ],
@@ -56,7 +56,7 @@ async def new_user(session):
     url = "http://0.0.0.0:4000/user/new"
     headers = {"Authorization": "Bearer sk-1234", "Content-Type": "application/json"}
     data = {
-        "models": ["gpt-4", "text-embedding-ada-002", "dall-e-2"],
+        "models": ["gpt-4", "text-embedding-ada-002", "gpt-image-1"],
         "duration": None,
     }
 
@@ -264,7 +264,7 @@ async def image_generation(session, key):
         "Content-Type": "application/json",
     }
     data = {
-        "model": "dall-e-2",
+        "model": "gpt-image-1",
         "prompt": "A cute baby sea otter",
     }