Building Simulations with a Single Prompt on GPT-5

The ability to build complex, interactive simulations used to demand days of coding, debugging, and fine-tuning. With GPT-5, that reality is changing. In this article, we explore how a single well-crafted prompt can produce fully functional, visually engaging applications with no manual coding required. We’ll build two examples from scratch. One simulates the collision of solid spheres with adjustable properties, and another visualizes gravitational force across different planets. From real-time physics updates to immersive visual comparisons, these simulations demonstrate the new frontier of AI-assisted development, where creativity meets instant execution.

Table of Contents

• What’s New in GPT-5
• The Power of Prompting
• Gravity Comparison Simulation
• Virtual Collision Testing Lab
• Building Dynamic Applications with GPT-5

What’s New in GPT-5

GPT-5 marks a monumental leap in AI, blending speed, accuracy, and deep reasoning into a single, unified model. It’s OpenAI’s most expert-level release yet, delivering PhD-grade performance across domains like coding, health, and math, while dramatically reducing hallucinations and deceptive responses. With a smart response router, GPT-5 adapts its thinking depth dynamically. Enhancements include customizable personalities, advanced voice, seamless integration with tools like Gmail and Calendar, and improved safety via nuanced “safe completions” rather than blunt refusals. In essence, GPT-5 is more reliable, expressive, and accessible than any previous model.

GPT-5 is a game-changer for game and simulation development. It features a unified architecture that automatically selects the best processing path, enabling it to generate complete, interactive simulations from a single prompt.

The Power of Prompting

The power of prompting lies in its ability to translate a designer’s high-level vision into a fully functional product. With its advanced reasoning and unified architecture, a single, detailed prompt can act as a blueprint for an entire game, from its core gameplay loop to its user interface and underlying code. By providing clear, specific, and well-structured prompts, creators can leverage GPT-5’s capabilities to autonomously generate complex, interactive experiences. This shifts the focus from manual development to creative direction, making a nuanced understanding of prompt engineering the key to unlocking GPT-5’s full potential.

Gravity Comparison Simulation

Gravitation comparison prompt

A single, elegantly crafted GPT-5 prompt instantly generated a complete, interactive HTML application. Users can choose any two planets (including Earth’s moon) from dropdowns, set the drop height and mass, then watch in real time as a ball falls, with time elapsed, velocity, and gravitational acceleration displayed side by side.

Gravitation comparison visual

Virtual Collision Testing Lab

Prompt for collision testing simulation

In this simulation, users can input properties like mass, initial velocity, and coefficient of restitution (elasticity) for two solid spheres. The simulation animates their collision in real time, dynamically displaying velocities before and after impact. This interactive visual deliversan intuitive understanding of collision dynamics, perfect for both learning and experimentation.

Collision testing visuals

Building Dynamic Applications with GPT-5

Our simulations so far, like gravity comparison and collision testing, were generated as single, static HTML files that you simply save and double-click to launch. This “vibe-coding” approach works beautifully for fast prototyping and lightweight demos. However, GPT-5’s real strength lies in building dynamic, stateful web applications, think live data, interactivity, and multi-step flows. As recent previews show, GPT-5 can scaffold rich, responsive React or Next.js apps with TypeScript and Tailwind, manage tool chains automatically, and even generate full project structures including documentation and tests. The future lies in prompting GPT-5 to go beyond static pages and into full-fledged, dynamic applications.

Final Words

The shift from traditional coding to prompt-based development with GPT-5 marks a profound change. The examples we’ve explored, from simple gravity and collision simulations to the potential for full-fledged web applications, show that the barrier between idea and execution is dissolving. The future of development isn’t just about what you can code, but what you can imagine and articulate through a prompt. I encourage you to move beyond static, single-file prototypes. Experiment with building dynamic, stateful applications using frameworks like React. The power is now in your hands to architect and create with unprecedented speed and scale. The next great digital experience is just a prompt away.

References and Codes

• Try GPT-5
• GPT-5 documentation
• Github Repository