Epic Games has put two decisions on the record in two weeks. On October 27, 2026, its executive vice president of development, Marcus Wassmer, told This Week in Videogames that Epic is using AI to write code for Unreal Engine and Fortnite: “Yes, we are vibe-coding things.” On November 3, at Unreal Fest Tokyo, Epic said Unreal Engine 6 will move gameplay development to its Verse language and drop Blueprints, partly because AI reads Verse far better.
The reaction is now one of the loudest arguments in games on X: a meme post predicting Epic’s fall passed 939,000 views this weekend, and an October post by the asset maker Kenney telling developers not to “let billionaires convince you slop is the future” sits near 900,000. Below: what Epic actually said, what changes in Unreal Engine 6, and what it means for teams that build with AI.
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On October 27, 2026, Epic’s Marcus Wassmer said Epic is vibe-coding Unreal Engine and Fortnite work: engineers no longer write the bulk of the code.
Engineers still guide the tools toward the architecture Epic wants, he said, iterating within memory and performance limits.
At Unreal Fest Tokyo, Epic said UE6 projects drop Blueprints and the C++ Gameplay Framework; gameplay moves to Verse, which AI reads better.
The argument on X is loud: a meme post predicting Epic’s fall passed 939,000 views and Kenney’s anti-slop post about 898,000.
Epic targets the first UE6 preview for the second half of 2027 and will test migration on Fortnite first; it gave no AI code share.
§ 01What Epic said about AI and its own code
The statement came in a written reply to This Week in Videogames. Wassmer’s full answer: “That means our engineers are no longer writing the bulk of the code, but they are still guiding the tools to get the architectural result we want.” And: “We’re not ‘one-shotting’ the engine; we’re iterating with AI to ship features developers want and keep the engine within the memory, performance, and scalability envelopes.”
Asked about skeptics, he added: “We are more concerned about the risks of moving too slowly than we are about AI skepticism.” Rock Paper Shotgun carried the same quotes the next day.
The claim is narrower than the memes: engineers still set the architecture and review the result, and Epic gave no share of code written by AI, no list of features built this way, and no defect numbers.
§ 02What changes in Unreal Engine 6
Epic Games Japan’s post-event release from Unreal Fest Tokyo lays out the plan. Gameplay development moves to Verse, and UE6 projects will no longer include Blueprints or the C++ Gameplay Framework. Epic says the change also prepares for AI-assisted workflows, because AI reads Verse code far more accurately than Blueprints.
| Area | What Epic says | Status |
|---|---|---|
| Gameplay code | Moves to Verse | Planned for UE6 |
| Blueprints and C++ Gameplay Framework | Not included in UE6 projects | Planned for UE6 |
| AI models | An MCP plugin so developers use the model they choose | Announced, no date |
| Migration | Tested on Fortnite first, then shared with developers | Planned |
| First UE6 preview | Second half of 2027 | Target date |
Blueprints are Unreal’s visual scripting system, used by a large share of designers and smaller studios who do not write C++. Removing them is the part of the announcement developers are angriest about, more than the AI line itself.
§ 03Sweeney’s line, and the backlash
According to Kotaku, which relayed Japanese coverage of his Tokyo remarks, CEO Tim Sweeney said the gap between studios that adopt AI tools and those that do not will grow: “This trend is unlikely to be reversed.” He later restated it on X, per Kotaku: “AI is happening, AI won’t un-happen, and Epic is going all-in to bring the gains to all game developers.”
| Date | Post | Views |
|---|---|---|
| October 18 | Kenney: “Don’t let billionaires convince you slop is the future” | About 898,000 |
| October 27 | Wassmer to This Week in Videogames: “Yes, we are vibe-coding things” | Not an X post |
| November 3 | Unreal Fest Tokyo: UE6 drops Blueprints | Not an X post |
| This weekend | Meme post predicting Epic’s fall in about a year | About 939,000 |
The Kenney post drew a sharp public reply from Sweeney the same day. Both sides are arguing about different things: Kenney about AI-generated art and craft, Epic about AI-written engine code that engineers still direct.
§ 04What this means if you build software
- Engineers guide, AI writes the bulk: that is now a stated policy at a major engine maker. Wassmer’s description, iterate with AI inside memory and performance limits, is how most serious teams use coding agents today.
- Languages are being chosen for AI readability. Epic’s own reason for Verse over Blueprints is partly that AI reads it better. Expect more tools to be judged by how well an agent can work in them.
- The cost lands on users who built on the old tools. Blueprint-heavy teams face a migration, and Epic’s tooling for it is promised but not yet shown.
§ 05What we are watching
- Migration tools. What Epic ships from its Fortnite migration, and when.
- Numbers. Any share of Unreal Engine code written with AI, or quality data.
- The UE6 preview. Whether the second half of 2027 holds.
§ 06Sources
- This Week in Videogames, Epic Games confirms AI is being used to develop code for Unreal Engine, October 27, 2026
- Rock Paper Shotgun, Epic get more specific about genAI use
- Epic Games Japan via PR Times, Unreal Fest Tokyo 2026 release, November 5, 2026
- Kotaku, Tim Sweeney insists AI adoption unlikely to be reversed, November 5, 2026
- Kenney on X, October 18, 2026
Q1What did Marcus Wassmer say?
That Epic is vibe-coding things: engineers no longer write the bulk of the code but guide the tools, iterating with AI rather than generating the engine in one shot.
Q2Why is Epic moving to Verse?
Epic says gameplay development moves to Verse and that AI reads Verse code far more accurately than Blueprints, which suits AI-assisted workflows.
Q3What did Tim Sweeney say?
Kotaku relays him saying the gap between studios that adopt AI tools and those that do not will grow, and that the trend is unlikely to be reversed.
Q4Will Epic help developers migrate?
Epic says it will test migration on Fortnite first and then share what it learns and migration tools. It has not shown the tools yet.
Q5Does Epic say how much code AI writes?
No. Epic gave no share of code written by AI, no feature list and no defect data.