From 04a931337fa5597eb457bb3bdb2946bbcba6b9a3 Mon Sep 17 00:00:00 2001
From: can1357 <me@can.ac>
Date: Mon, 8 Jun 2026 03:15:27 +0200
Subject: [PATCH] fix(openai-responses): keep open function calls when starting
 text/thinking

- Stopped prematurely closing function call parts on output_text and thinking_start.
- Only close the open part when it is not a function_call.
---
 packages/ai/src/providers/openai-responses-server.ts | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/packages/ai/src/providers/openai-responses-server.ts b/packages/ai/src/providers/openai-responses-server.ts
index de462a831..5c507cd67 100644
--- a/packages/ai/src/providers/openai-responses-server.ts
+++ b/packages/ai/src/providers/openai-responses-server.ts
@@ -966,8 +966,7 @@ export function encodeStream(
 								cur = state.open;
 								cur.currentPartText = "";
 							} else {
-								closeOpenFunctionCalls();
-								if (state.open) closeOpen();
+								if (state.open && state.open.kind !== "function_call") closeOpen();
 								cur = openMessage();
 							}
 							const part = { type: "output_text", text: "", annotations: [] as never[] };
@@ -1018,8 +1017,7 @@ export function encodeStream(
 							break;
 						}
 						case "thinking_start": {
-							closeOpenFunctionCalls();
-							if (state.open) closeOpen();
+							if (state.open && state.open.kind !== "function_call") closeOpen();
 							openReasoning(ev.partial, ev.contentIndex);
 							break;
 						}