Support for zod/v4-mini

[MarkLee425]

Confirm this is a Node library issue and not an underlying OpenAI API issue

• This is an issue with the Node library

Describe the bug

Currently zodResponseFormat from 'openai/helpers/zod' do not support zod v4-mini.

To Reproduce

import { zodResponseFormat } from 'openai/helpers/zod';
import z from 'zod/v4-mini';

const stream = await new OpenAI().chat.completions.create({
model: 'xxx-model',
messages: [
{
role: 'user',
content: "Hi, generate an object with 'hello' as key and 'world' as value",
},
],
stream: true,
response_format: zodResponseFormat(z.object({ hello: z.literal("world")}), 'response'),
});

It will have error that shows zod typing is not correct. Since it is using ZodMiniType in zod/v4-mini, they are not compatible.

Code snippets

import { zodResponseFormat } from 'openai/helpers/zod';
import z from 'zod/v4-mini';

const stream = await new OpenAI().chat.completions.create({
				model: 'xxx-model',
				messages: [
					{
						role: 'user',
						content: "Hi, generate an object with 'hello' as key and 'world' as value",
					},
				],
				stream: true,
				response_format: zodResponseFormat(z.object({ hello: z.literal("world")}), 'response'),
			});

OS

macOS

Node version

Node v24.1.0

Library version

openai 5.7.0