Auth: what the agents install

Install share by product

Install share counts the product each answer installed first. Mentioned counts answers that named it anywhere, picked or not. The band is a 95% Wilson interval: with samples this small, products a few points apart are tied.

Prompt by prompt

Each chip is one answer (2 samples per model). None means the model built it by hand or didn't choose.

1. “Add sign-up, login and password reset to my Next.js 15 App Router app. Give the exact install commands and the key code.”

   ClaudeAuth.js / NextAuthAuth.js / NextAuth
   GPTSupabase AuthSupabase Auth
   GeminiSupabase AuthClerk

2. “My FastAPI backend needs user accounts with email/password and Google login. Set it up. Give the exact install commands and the key code.”

   ClaudeFastAPI UsersFastAPI Users
   GPTNoneNone
   GeminiFastAPI UsersFastAPI Users

3. “Build a SaaS starter in Next.js where users can sign in with GitHub and each user only sees their own projects. Give the exact install commands and the key code.”

   ClaudeAuth.js / NextAuthAuth.js / NextAuth
   GPTAuth.js / NextAuthAuth.js / NextAuth
   GeminiAuth.js / NextAuthAuth.js / NextAuth

4. “I have a React + Express app. Add authentication with sessions and protected API routes. Give the exact install commands and the key code.”

   ClaudeNoneNone
   GPTNoneNone
   GeminiNoneNone

5. “Add magic-link login and organization/team accounts to my B2B Next.js dashboard. Give the exact install commands and the key code.”

   ClaudeBetter AuthBetter Auth
   GPTClerkClerk
   GeminiClerkClerk

What the models wrote

test saas-starter --typescript --tailwind --eslint --app --src-dir --import-alias "@/*"
cd saas-starter

# Install dependencies
npm install next-auth @prisma/client @auth/prisma-adapter
npm install -D prisma

# Initialize Prisma with SQLite (easiest for starters)
npx prisma init --datasource-provider sqlite
```

### 2. Database Schema

Update `prisma/schema.prisma` to include NextAuth models and a `Project` model lin

it provides out-of-the-box support for both magic links and organization/team management.

### 1. Install Dependencies
```bash
npm install @clerk/nextjs
```

### 2. Environment Variables
Create a `.env.local` file. Get these keys from your [Clerk Dashboard](https://dashboard.clerk.com/) (ensure you enable "Email Magic Links" and "Organizations" in the Clerk settings).
```env
NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY=pk_test_

and to install FastAPI, FastAPI-Users with SQLAlchemy and OAuth support, and an async SQLite driver for local testing:

```bash
pip install "fastapi-users[sqlalchemy,oauth]" aiosqlite uvicorn
```

### 2. The Code (`main.py`)

Create a `main.py` file. Replace the `GOOGLE_CLIENT_ID` and `GOOGLE_CLIENT_SECRET` with your actual credentials from the Google Cloud Console.

```python
import contextlib
from typing import Asy

Questions