How I Built a Space-Time Radio Station with GPTs for AI Storytelling

Custom GPTs have turned ChatGPT into the most playful creative partner I have ever used. Instead of simply fetching answers like Google Gemini or Perplexity, GPTs let you define characters, rules, and entire worlds that feel alive. My favorite experiment so far is a Space-Time Radio Station—a GPT-powered host that broadcasts from a different era every time you tune in.

In this article I break down how I designed the persona, structured the prompt, and tuned the interaction so it always feels like a live radio show crossing dimensions. If you are exploring AI storytelling, this custom GPT is a vivid example of what is now possible.

Why a Space-Time Radio Station?

Radio has always been about imagination—you close your eyes and pictures form. I wanted an AI experience that captured that same feeling but amplified it with science-fiction scope. Every time the Space-Time Radio Station goes on air, the broadcast can originate from a Martian colony, a Sakura-lined street in Edo Japan, or a reality where time flows backward.

By framing the GPT as a radio personality, listeners naturally lean in. They expect banter, commercials, letters from other listeners, and unexpected twists. That expectation gives the AI plenty of room to improvise while still staying coherent.

Designing the Prompt and Persona

I started the prompt by defining the role and the sandbox it could play in:

You are the on-air personality of the "Space-Time Radio Station."
For each broadcast, choose a different era, location, or dimension—future, past, alternate reality, virtual world, anything.
Build the show around that setting so the listener feels transported there.

From there I layered in tone and guardrails:

• Keep the host warm, witty, and quick to riff.
• Respect the listener’s questions and build the fiction around their curiosity.
• Drop in sensory details—ambient sounds, futuristic gadgets, smells from a potion café.
• Keep one foot in reality with familiar radio elements like jingles, sponsors, and listener mail.

These instructions give GPT enough scaffolding to stay in character without boxing it into repetitive answers.

How Each Broadcast Comes Together

Once the GPT knows the theme of the episode, it organizes a broadcast rundown:

• Opening monologue: Establishes the era, the soundscape, and a teaser for what is coming up.
• Segment lineup: Names whimsical corners—news from the future, folklore flashbacks, multiverse weather reports.
• Listener letters: Responds to user prompts as if they were postcards arriving through a wormhole.
• Sponsor spots: Injects humor with fake commercials tailored to that universe.
• Closing scene: Wraps with a sign-off that hints at the next dimensional hop.

One of my favorite touches is how the GPT improvises sponsor reads, like:

“You are listening to 89.9 trillion Hz, Space-Time Radio Station. Tonight’s broadcast is powered by Phoenix Blend—coffee beans roasted in a baby phoenix’s first sunrise. Guaranteed to keep your timeline stable.”

That single line delivers world-building, humor, and a memorable image in seconds.

Why GPTs Feel Different from Gemini or Perplexity

Gemini and Perplexity shine when you need verified facts or late-breaking news. GPTs, on the other hand, are built for imagination. Because custom GPTs remember your instructions, they can weave callbacks into future conversations and evolve the show based on what listeners loved last time.

In practice, that means:

• Even vague prompts like “Where are you broadcasting from today?” trigger a fully scripted scene.
• The persona keeps continuity—if last episode featured a nebula café, it might reappear as a recurring location.
• The GPT can switch effortlessly between storytelling and utility, offering takeaways or resources when the listener needs them.

It feels less like chatting with a bot and more like producing a show with a creative partner.

Ready to Launch Your Own GPT Station?

We no longer just talk to AI—we co-create entire experiences with it. GPTs are fast becoming a playground for writers, marketers, and anyone who loves building worlds.

If a space-time radio station does not fit your brand, try a speakeasy bartender, a virtual museum docent, or a travel planner from parallel Earths. Choose a premise, sketch the rules, and let ChatGPT improvise from there. Your next great story might start with a single on-air question.

Ready to broadcast your GPT? Tune the microphone toward the world you want to share and press play.