From 2fb99143a47d2524ef6d9675f9eeb692c190c90d Mon Sep 17 00:00:00 2001
From: Peter Steinberger <steipete@gmail.com>
Date: Sun, 10 May 2026 05:23:44 +0100
Subject: [PATCH] fix(openai): use chat completion choice delta type

---
 src/agents/openai-transport-stream.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/agents/openai-transport-stream.ts b/src/agents/openai-transport-stream.ts
index c341720e00b..357305504b9 100644
--- a/src/agents/openai-transport-stream.ts
+++ b/src/agents/openai-transport-stream.ts
@@ -1520,7 +1520,8 @@ async function processOpenAICompletionsStream(
       }
     }
     const choiceDelta =
-      choice.delta ?? (choice as unknown as { message?: ChatCompletionChunk["delta"] }).message;
+      choice.delta ??
+      (choice as unknown as { message?: ChatCompletionChunk["choices"][number]["delta"] }).message;
     if (!choiceDelta) {
       continue;
     }