OpenAI Just Added Pets to Codex. Here’s How to Hatch Your Own.

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OpenAI , on May 1 did something nobody expected from a coding tool. They added pets.

Not a productivity feature. Not a new model. Tiny animated creatures that live in the corner of the Codex app, reacting to what the code is doing — thinking when it’s processing, waiting when it’s idle, celebrating when a task completes.

Developers are losing their minds over it. And there’s a reason this matters beyond the cute factor.

What Are Codex Pets?

Codex Pets are customizable animated companions inside OpenAI’s Codex desktop app. They reflect the app’s real-time status through small behavioral animations — so a glance at your pet tells you whether Codex is thinking, waiting, done, or stuck on an error.

There are eight built-in pets to choose from: Codex, Dewey, Fireball, Rocky, Seedy, Stacky, BSOD, and Null Signal. Type /pet to summon or dismiss them.

But the real magic is hatching a custom pet using the hatch-pet skill.

How to Hatch Your Own Pet (Step-by-Step)

Step 1: Open the Codex desktop app (not the web version — download from codex.openai.com).

Step 2: Install the hatch-pet skill. Type this in the chat:

$skill-installer hatch-pet

Step 3: Press Ctrl+K (Windows) or Cmd+K (Mac), then choose Force Reload Skills.

Step 4: Type your hatch command:

Hatch Pet: create a mechanical tortoise with circuit board shell, glowing green LEDs

Step 5: Watch the 4-step process:

• Getting your pet ready
• Imagining the main look
• Picturing the poses
• Hatching the final pet

This takes 2–5 minutes. Codex generates a proper sprite atlas with animations, packages it as a pet.json file, and installs it automatically.

Step 6: Go to Settings → Appearance → Pets and select the new pet under “Custom pets.” If it doesn’t appear, restart the Codex app.

Step 7: Start any coding task and watch the pet react — it animates based on what Codex is doing: thinking, idle, done, or error.

The Secret: State-Based Actions

A basic prompt like “make me a cute dog” gives a generic result. The difference between a basic pet and a great one is telling Codex exactly how the pet should behave in each state.

Codex Pets respond to five triggers:

• Idle — waiting for input
• Thinking — Codex is processing
• Done — code completes successfully
• Error — something failed
• Clicked — when you click on the pet

Here’s the formula:

Hatch Pet: [creature description]. When thinking: [action]. When idle: [action]. When code completes: [action]. When error: [action]. When clicked: [action].

The more specific the actions, the more personality your pet has.

8 Cute Pet Prompts — Ready to Copy and Paste

1. Circuit — The Mechanical Tortoise

Hatch Pet: create a mechanical tortoise with circuit board shell, glowing green LEDs. When thinking: shell LEDs pulse rapidly, tiny code scrolls across shell. When idle: gentle head bob, slow shell glow. When code completes: LEDs flash gold, tiny sparks from shell, happy wiggle. When error: shell turns red, tortoise retreats into shell, peeks out nervously. When clicked: shell opens to reveal tiny server rack inside.

More Prompts to Try

These haven’t been hatched yet — try them and share the results on X @EntrepreneursAI..

2. PixelPup — The Coding Puppy

Hatch Pet: create an adorable tiny golden puppy sitting at a miniature desk. When thinking: ears perk up, paws type on keyboard, tail wags fast. When idle: curls up and naps, tiny snore bubbles float up. When code completes: jumps up, spins in circle, happy bark sparkles appear. When error: tilts head confused, drops tiny bone, whimpers with sad puppy eyes. When clicked: rolls over for belly rub, tongue out.

3. BubbleCat — The Cloud Kitty

Hatch Pet: create a fluffy pastel cat made of soft clouds with tiny rainbow sparkles trailing behind. When thinking: puffs up bigger, rainbow swirls around body, eyes glow bright. When idle: floats peacefully, purrs with tiny hearts appearing above head. When code completes: does a backflip in clouds, rains down tiny golden stars. When error: deflates slightly, tiny storm cloud appears over head, looks grumpy. When clicked: stretches and yawns, rainbow trail intensifies.

4. OctoByte — The Baby Octopus

Hatch Pet: create an adorable baby octopus with big sparkly eyes, each tiny tentacle holding a different colored crayon. When thinking: tentacles draw frantically in the air, ink cloud of binary code appears. When idle: gentle floating, tentacles wave hello, blows tiny bubbles. When code completes: tentacles do jazz hands, eyes turn into hearts, confetti shoots everywhere. When error: tentacles tangle into a knot, blushes pink, hides behind one tentacle. When clicked: squirts tiny ink heart, giggles.

5. ToastBuddy — The Breakfast Friend

Hatch Pet: create an adorable piece of golden toast with a cute smiley face, tiny butter pat hat, stick arms and legs. When thinking: face scrunches in concentration, butter melts slightly, steam rises from head. When idle: bounces gently in place, waves with tiny jam-covered hand. When code completes: pops up like from a toaster, butter hat flies off and lands back perfectly, crumb confetti. When error: gets slightly burnt on one edge, smoke puffs from corner, looks shocked. When clicked: does a little spin, jam drips and reforms.

6. StarJelly — The Space Jellyfish

Hatch Pet: create a tiny translucent jellyfish made of starlight, trailing glowing tentacles with tiny planets attached. When thinking: pulses brighter, tentacles swirl faster, tiny shooting stars orbit around body. When idle: drifts peacefully, tentacles trail sparkles, soft cosmic glow pulses. When code completes: explodes into mini supernova then reforms beautifully, planets align and spin. When error: briefly turns into tiny black hole, tentacles get tangled, looks dizzy with spiral eyes. When clicked: shoots a comet trail across screen.

7. SproutBot — The Plant Robot

Hatch Pet: create a tiny robot shaped like a flower pot with a smiling daisy growing from its head, little leaf arms, root feet. When thinking: daisy spins like a radar dish, leaves flutter rapidly, pot glows warm. When idle: sways gently like in a breeze, petals slowly open and close, hums. When code completes: daisy blooms into a giant sunflower, throws seeds like confetti, does victory dance. When error: daisy wilts dramatically, leaves droop, pot cracks then magically repairs. When clicked: grows a tiny new flower, giggles.

8. ChipOwl — The Robot Owl

Hatch Pet: create a tiny robot owl with purple feathers, glowing yellow circuit board eyes, wearing tiny goggles on head. When thinking: eyes pulse brighter, head rotates 360 scanning, goggles flip down over eyes. When idle: head tilts side to side, gentle floating, soft mechanical hoot. When code completes: wings flap wide and sparkle, hoots triumphantly, goggles flash victory sign. When error: eyes turn red, feathers ruffle up, covers face with wing embarrassed. When clicked: winks one eye, does a little bow.

Tips for Better Pets

Be specific about personality. “A cute cat” gives a generic result. “A fluffy pastel cat made of soft clouds with tiny rainbow sparkles” gives something memorable.

Make error states funny. The best pets turn frustration into a smile. A tortoise retreating into its shell, toast getting burnt, an octopus tangling its own tentacles — these moments are why developers love this feature.

Add a click reaction. Most people forget this one. A pet that reacts when clicked adds a layer of interactivity that makes the pet feel alive even when Codex is idle.

Name your pet. Codex will suggest a name, but specifying one in the prompt gives better results.

Why This Actually Matters

On the surface, Codex Pets look like a fun easter egg. Three things are happening under the hood that matter for builders:

1. Status communication without interruption. Instead of checking a progress bar, the pet’s behavior tells you what Codex is doing. It’s ambient awareness — a glance replaces a context switch.

2. Emotional attachment drives retention. When users name something, customize it, and watch it react to their behavior, they come back more often. OpenAI isn’t adding a feature. They’re adding a reason to stay.

3. Community as growth engine. Every developer who shares their pet on X is advertising Codex to their followers. OpenAI gets distribution for free. The pet is the hook. The platform is the play.

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