diff --git a/tests/e2e/llm_translation/test_chat_completions_regression_e2e.py b/tests/e2e/llm_translation/test_chat_completions_regression_e2e.py
index cb6d1cd3a51..df50f86aab3 100644
--- a/tests/e2e/llm_translation/test_chat_completions_regression_e2e.py
+++ b/tests/e2e/llm_translation/test_chat_completions_regression_e2e.py
@@ -47,6 +47,7 @@ COHERE_BACKEND = "cohere/command-r-08-2024"
 GEMINI_BACKEND = "gemini/gemini-2.5-flash"
 VERTEX_BACKEND: Final = "vertex_ai/gemini-2.5-flash"
 AZURE_OPENAI_BACKEND: Final = "azure/gpt-5.6-sol"
+AZURE_OPENAI_API_VERSION: Final = "v1"
 AZURE_FOUNDRY_BACKEND: Final = "azure_ai/claude-haiku-4-5"
 OPENAI_BACKEND = "openai/gpt-5.6"
 ANTHROPIC_BACKEND = "anthropic/claude-haiku-4-5-20251001"
@@ -459,6 +460,7 @@ class TestAzureOpenAIChatCompletions:
                 model=AZURE_OPENAI_BACKEND,
                 api_base="os.environ/AZURE_API_BASE",
                 api_key="os.environ/AZURE_API_KEY",
+                api_version=AZURE_OPENAI_API_VERSION,
             ),
         )
         resources.defer(lambda: client.proxy.delete_model(model_id))
diff --git a/tests/e2e/llm_translation/test_responses_e2e.py b/tests/e2e/llm_translation/test_responses_e2e.py
index 22a3d683081..5770bafe00e 100644
--- a/tests/e2e/llm_translation/test_responses_e2e.py
+++ b/tests/e2e/llm_translation/test_responses_e2e.py
@@ -41,6 +41,7 @@ class _OptionalResponsesBody(BaseModel):
 BEDROCK_CONVERSE_BACKEND = "bedrock/us.anthropic.claude-haiku-4-5-20251001-v1:0"
 VERTEX_BACKEND: Final = "vertex_ai/gemini-2.5-flash"
 AZURE_OPENAI_BACKEND: Final = "azure/gpt-5.6-sol"
+AZURE_OPENAI_API_VERSION: Final = "v1"
 
 WEATHER_TOOL = ResponsesFunctionTool(
     name="get_weather",
@@ -375,6 +376,7 @@ class TestResponses:
                 model=AZURE_OPENAI_BACKEND,
                 api_base="os.environ/AZURE_API_BASE",
                 api_key="os.environ/AZURE_API_KEY",
+                api_version=AZURE_OPENAI_API_VERSION,
             ),
         )
 
@@ -397,6 +399,7 @@ class TestResponses:
                 model=AZURE_OPENAI_BACKEND,
                 api_base="os.environ/AZURE_API_BASE",
                 api_key="os.environ/AZURE_API_KEY",
+                api_version=AZURE_OPENAI_API_VERSION,
             ),
         )