Codex gonna kill Unity.
This is not about “Unity developers losing some value.”
It is much more fundamental than that.
We are moving toward a world where games are made without opening Unity at all.
For years, game development started with Unity.
Open Unity Hub.
Create a project.
Make a scene.
Drop in prefabs.
Touch the Inspector.
Write C#.
Import assets.
Build UI.
Run the game.
Break everything.
Fix it.
Repeat.
That was what “making a game” meant.
But if Codex can generate game logic, UI, assets, controls, and behavior from natural language, the user no longer needs to open Unity.
You just say:
“Make me this kind of game.”
“Make it more fun.”
“Make it mobile-friendly.”
“Add more enemies.”
“Make the scoring feel better.”
“Turn this prototype into something playable in 3 minutes.”
And the game appears.
Once people get used to that workflow, why would they go back to staring at the Unity editor?
They won’t.
Especially beginners won’t.
And that is the real problem for Unity.
Unity’s power was that it was the front door to game development.
If you wanted to make a game, you learned Unity.
But the next generation will not start there.
Their first game engine will be Codex.
Their first programming language will be natural language.
Their first prototype will not be a Unity project.
Their first bottleneck will not be C#.
It will be taste.
If AI is making the game, it does not have to be Unity.
It can be Web.
It can be Godot.
It can be a lightweight runtime.
It can be a custom engine.
It can be some weird generated environment that only exists for that game.
The player does not care what engine made it.
Soon, the creator will not care either.
Unity was built for a world where humans needed a giant visual editor to manage the complexity of game development.
But AI agents do not need that same interface.
They need fast iteration.
Clean code.
Immediate previews.
Automated tests.
Cheap branching.
Disposable prototypes.
Mass generation.
Unity is not optimized for that world.
It is heavy.
Stateful.
Editor-centric.
Human-centric.
Slow to spin up and tear down.
AI-native game development will not look like a giant editor.
It will look like prompts, agents, code, tests, previews, and endless generated prototypes.
So the future is not:
games made in Unity with AI assistance.
The future is:
games made by AI without Unity.
That means fewer Unity projects.
Fewer beginners learning Unity.
Fewer prototypes starting in Unity.
Fewer studios waiting for Unity talent.
Fewer small games needing Unity at all.
Unity will still exist.
Large studios, legacy projects, enterprise use cases, and existing pipelines will keep it alive for a while.
But Unity will stop being the default entrance to game development.
And once a platform loses the entrance, it starts dying.
Flash died that way.
jQuery faded that way.
A lot of tools die not because they stop working, but because the next generation stops starting there.
Codex is not replacing Unity feature by feature.
It is making Unity unnecessary.
That is much worse.
Codex is not coming for Unity developers.
Codex is coming for the idea that games need Unity in the first place.
And Unity has never posted an annual GAAP profit as a public company.
なん...だと...
Codexが今度はパズルゲームをあっという間に開発してくれました
UI・キャラ等のアセットも自動で生成してくれてます