One-Shotting a Slack Clone with Fable 5

Melvin Vivas · X video post · 2026-06-11 · Open on X

Topics: AI Dev Tools & Productivity, Prompt & Context Engineering, Portfolio Projects · Level: beginner

Summary

A user gave Fable 5 one prompt asking for a 1:1 Slack clone in TypeScript, Electron, Tailwind and SQLite. It produced both the UI and the server in under 10 minutes. The example shows how much a single detailed prompt that names the tech stack can produce.

Key points

• Prompt: 'Create a 1:1 clone of Slack using Typescript, Electron, Tailwind, SQLite. Make it beautiful and functional.'
• Naming the exact tech stack in the prompt steers the output
• Fable 5 one-shotted the UI and the server in under 10 minutes
• Treat it as a strong first draft, not finished software

Resources mentioned

• Fable 5 · tool · anthropic.com · paid
  A frontier model used as the comparison point in the Claude Opus 5 announcement; the post gives no other details about it.
  Also in: Claude Opus 5.5 in Devin: #1 on FrontierCode 1.1 (Melvin Vivas on X · notes), Creator's Top 3 Closed Models: Fable 5, GPT 5.6 Sol, Grok 4.6 (Melvin Vivas on X · notes), Opus 5 vs Fable 5: Cost per Task in Cursor Benchmarks (Melvin Vivas on X · notes), Opus 5 Beats Fable 5 on Cost per Task and Tokens (Melvin Vivas on X · notes) and 7 more
• Electron · tool · electronjs.org · free
  Framework for building cross-platform desktop apps with web technologies.
  Also in: Coworker: An Open-Source Desktop Agent App for Local and Cloud Models (Melvin Vivas on X · notes)
• Tailwind CSS · tool · tailwindcss.com · free
  Utility-first CSS framework.
• SQLite · tool · sqlite.org · free
  A lightweight embedded SQL database stored in a file.
  Also in: Why Plan Mode Still Matters in AI Coding Agents (Codex, Claude, Cursor) (Melvin Vivas on X · notes), Running Qwen3.8-27B EXL3 Locally on an RTX 3090 with 220K+ Context (Melvin Vivas on X · notes), Google Antigravity 2.0: Multi-Agent Desktop App Walkthrough (Subagents, Scheduled Tasks) (Melvin Vivas on X · notes), Local Qwen 3.5 Adds an Express API and SQLite to Make an App Full-Stack (Melvin Vivas on X · notes)
• TypeScript · tool · typescriptlang.org · free
  Typed superset of JavaScript.

Try this

• Try a one-shot app prompt that names the exact tech stack
• Build a 1:1 Slack clone with TypeScript, Electron, Tailwind and SQLite using an AI coding model