Molten Super Chat

A ChatGPT-style web app with multi-model support. Pick any model when starting a chat, or run one prompt against multiple models and compare outputs side by side.

Stack

• Next.js 16 (App Router)
• Vercel AI SDK (ai, @ai-sdk/react) with direct providers: OpenAI, Anthropic, Google (Gemini)
• Drizzle + Postgres for chat and compare persistence

Setup

1. Install dependencies: pnpm install
2. Copy .env.example to .env.local and set:
   • OPENAI_API_KEY
   • ANTHROPIC_API_KEY
   • GOOGLE_GENERATIVE_AI_API_KEY
   • DATABASE_URL (Postgres connection string)
3. Push schema: pnpm db:push (or run migrations)
4. Run dev: pnpm dev

Features

• Single-model chat: New chat → choose provider/model → conversation with persistence.
• Compare mode: One prompt → 2–4 models → parallel streamed outputs in columns.
• Persistent compare branches: Each model column is a branch; you can “Continue this branch” with a follow-up prompt.
• Promote: Turn a compare response into a new chat (Start chat from this).

Deploy (Railway)

• Project: molten-super-chat (linked via railway link in this directory).
• Service: web. Set DATABASE_URL and the three AI API keys as service variables (or use Railway Postgres and ${{Postgres.DATABASE_URL}}).
• Deploy on push: The web service is configured to build from https://github.com/switch-dimension/molten-super-chat on the main branch. Ensure your Railway workspace is connected to GitHub (dashboard → project/workspace settings) so pushes to main trigger automatic deploys.
• Domain: Generate or view the default *.railway.app domain in the service’s Networking settings. Custom domain: railway domain <your-domain.com> --service web.
• Migrations: Before or after first deploy, run schema against the deployment DB: DATABASE_URL='<url>' pnpm db:push (or your migrate command). Use the same DATABASE_URL as configured on Railway.

Scripts

• pnpm dev – development server
• pnpm build / pnpm start – production
• pnpm db:generate – generate Drizzle migrations
• pnpm db:push – push schema to DB (no migrations)
• pnpm db:migrate – run migrations