diff --git a/open-sse/translator/response/claude-to-openai.js b/open-sse/translator/response/claude-to-openai.js
index 2dfe0db..7e662d3 100644
--- a/open-sse/translator/response/claude-to-openai.js
+++ b/open-sse/translator/response/claude-to-openai.js
@@ -95,7 +95,7 @@ export function claudeToOpenAIResponse(chunk, state) {
         break;
       }
       if (state.inThinkingBlock && chunk.index === state.currentBlockIndex) {
-        results.push(createChunk(state, { reasoning_content: "" }));
+        results.push(createChunk(state, { content: "</think>" }));
         state.inThinkingBlock = false;
       }
       state.textBlockStarted = false;