From e092e11ce71bd1b3c4ba8ea1d73f00e4f5b168cc Mon Sep 17 00:00:00 2001
From: pin <7534292+pintaste@users.noreply.github.com>
Date: Wed, 20 May 2026 06:09:10 +0800
Subject: [PATCH] docs: fix incorrect API call in Nested params README example

The "Nested params" example called `client.chat.responses.create` with
an `input=` parameter, mixing two incompatible API surfaces:
- `client.chat.responses` does not exist (`Chat` only exposes `completions`)
- `input=[...]` is the Responses API shape, but `response_format` is a
  Chat Completions parameter

Fix by switching to `client.chat.completions.create` with the correct
`messages=` parameter name and a real model name (`gpt-4o`).

Fixes #3264
---
 README.md | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 90f1c2cbd9..f64f8d636b 100644
--- a/README.md
+++ b/README.md
@@ -475,14 +475,14 @@ from openai import OpenAI
 
 client = OpenAI()
 
-response = client.chat.responses.create(
-    input=[
+response = client.chat.completions.create(
+    messages=[
         {
             "role": "user",
-            "content": "How much ?",
+            "content": "Can you generate an example json object describing a fruit?",
         }
     ],
-    model="gpt-5.2",
+    model="gpt-4o",
     response_format={"type": "json_object"},
 )
 ```