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OpenAI Demonstrates Codex 'Sites' in Final Build Week Stream as Hackathon Deadline Nears

July 20, 2026 at 14:07 EDT

AI Agents
Software Dev & Coding

OpenAI showcased its Codex-powered "Sites" feature during the closing livestream of its global Build Week hackathon on July 20, 2026, urging participants to make a final push before submissions close. The stream demonstrated how developers can build, publish, and host interactive web apps and sites directly from Codex, the company's AI coding agent.

July 20, 2026 · OpenAI Build Week

Codex "Sites" Turns a Sentence Into a Hosted Web App

In the closing livestream of its global hackathon, OpenAI demoed Sites — a feature that lets Codex build, back, and host an interactive app from a natural-language prompt, framing the agent as a full-stack tool rather than a code assistant.

60+

Cities hosting in-person Build Week gatherings worldwide

~1 mo

Broadly available — real-world feedback still limited

GPT-5.6

Required model for all hackathon submissions

From prompt to live app — one agent, full stack

Codex doesn't just write code; it provisions the backend and deploys.

Describe idea
in natural language

→

Generate app
dashboard · tracker

→

Attach backend
database + storage

→

Host & share
workspace URL

Strengths

Build and host a web app directly from Codex
Near-instant deployment
Team sharing built in
Fits dashboards, trackers, internal portals, reports

Constraints

Sharing confined to a workspace — no public links
Availability depends on plan, region, settings
No custom domains — OpenAI-controlled URLs only
Feedback limited; still graduating from beta

The open question: adoption will hinge on whether OpenAI relaxes its current sharing, hosting, and plan restrictions as Sites moves beyond public beta.

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