Descriptions:
Alex Finn walks through building a complete stock investment app from scratch using ChatGPT Codex powered by GPT-5.5, making the case that it currently outperforms Claude Code for full-stack vibe coding. The video covers the entire development lifecycle: UI mockup generation, database setup, live API integration for stock data, portfolio tracking, and chart visualization.
A standout workflow demonstrated is Codex’s deep integration with GPT’s Image Gen 2 model, which generates multiple high-fidelity UI mockup options before any code is written — a design-first approach not available in competing agentic coding tools. Finn also showcases Codex’s multi-agent mode: running a developer agent building the app, a marketing agent drafting copy, and a research agent opening a live browser to search for top AI stocks simultaneously. The built-in browser preview inside Codex allows instant visual feedback without switching contexts.
The video includes practical guidance on Codex’s pricing tiers (free, $20/month, $200/month Pro), when to use medium versus fast intelligence modes, and why Finn prefers Codex over Claude Code for budget-constrained developers — noting that Anthropic is removing Claude Code from its $20/month plan. Viewers following along will finish with a functional stock tracker application built entirely through conversational prompting, making this one of the more complete Codex tutorials available at GPT-5.5’s launch.
📺 Source: Alex Finn · Published April 30, 2026
🏷️ Format: Hands On Build
