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Minecraft PvP against DiffusionGemma-as-Jev
Show HN for the public MCJev server where a diffusion language model picks combat moves from structured state.
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- Last verified
- Sep 2026
Works forJev for Realtime control
Used inJev for Gaming
Highlights
- 2 points. Story links https://mc.alexzms.com.
- Title claims about 24 ms per decision; details are on the landing page entry mcjev-pvp.
- Fighter uses DJev on the operator's engine, not TypeSafe's hosted API.
Watch out
Point totals move. Latency claims come from the project page, not this short thread.
Questions about this entry
Short answers drawn from the linked project or page.
Mostly the stack. The author credits a custom fast path on NVIDIA Blackwell hardware and notes the same model on stock vLLM took roughly 60 ms, so the headline number is not a portable property of the model.
No. A small hand-written controller handles aiming and walking while the model only picks the best option from a fixed nine-item menu each step. The entry makes the same point: this runs on the open model on the operator's engine, not the hosted API.
Nothing. The demo shows a bot choosing among nine hand-picked actions, with no labeled task, no ground truth and no accuracy measurement. It demonstrates latency and menu-scoring mechanics, and nothing about decision quality on your data.
Not from what is documented. The weights are open, but the speed claim depends on Blackwell GPUs and a hand-tuned path, and the thread offers no serving recipe, throughput target or cost comparison for ordinary hardware.
DJev, or DiffusionGemma-as-Jev from github.com/mmastrac/djev, runs Google's open DiffusionGemma-26B-A4B as a decision model. Each step scores every option on a fixed menu in one forward pass and plays the best one.
Nine: rush, strafe, circle, take cover, build a wall, draw the bow, lay a lava trap, crit and back off. A small hand-written controller handles the aiming and walking while the model only picks a move.
It is open at mc.alexzms.com and needs Java 1.9 or newer. The author says they are happy to answer questions about the serving side.
Reactions & coverage
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Hacker News: Show HN for public Minecraft PvP where a diffusion LM picks moves from structured state.
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