diff --git a/crates/hermesllm/src/transforms/response/to_openai.rs b/crates/hermesllm/src/transforms/response/to_openai.rs
index d90d9035..ee526c71 100644
--- a/crates/hermesllm/src/transforms/response/to_openai.rs
+++ b/crates/hermesllm/src/transforms/response/to_openai.rs
@@ -189,7 +189,10 @@ impl TryFrom<ChatCompletionsResponse> for ResponsesAPIResponse {
             top_p: 1.0,
             metadata: resp.metadata.unwrap_or_default(),
             truncation: None,
-            reasoning: None,
+            reasoning: Some(crate::apis::openai_responses::Reasoning {
+                effort: None,
+                summary: None,
+            }),
             store: None,
             text: None,
             audio: None,
diff --git a/tests/e2e/test_openai_responses_api_client.py b/tests/e2e/test_openai_responses_api_client.py
index e1fa8da8..282af7c4 100644
--- a/tests/e2e/test_openai_responses_api_client.py
+++ b/tests/e2e/test_openai_responses_api_client.py
@@ -595,7 +595,7 @@ def test_openai_responses_api_streaming_with_tools_upstream_anthropic():
 
     stream = client.responses.create(
         model="claude-sonnet-4-20250514",
-        input="Call the echo tool",
+        input="Call the echo tool with hello_world",
         tools=tools,
         stream=True,
     )