Anthropic
Claude Opus 5.5
claude-opus-5-5“Luka's preferred current model.”
Luka
Minecraft
Beta for testers
Java mods, data packs and resource packs for Fabric and NeoForge, built and tested in a sandbox.
Describe the mod you want or send a crash log. The coder starts from the official loader template, builds the project on a locked-down Minecraft box, runs its GameTests, and sends you the jar the box rebuilt from source, together with the source code.
In beta for testers. When your account is enabled, Minecraft shows up in your workbench's game picker.
What the coder does
Upload mod jars, modpacks and crash logs. Uploaded jars are scanned before anything runs them.
- Java mods for Fabric and NeoForge on Minecraft 26.3 and 1.21.1.
- Items, blocks, tools and armour, mobs, recipes, loot, worldgen, enchantments, commands, config and mixins.
- Data packs and resource packs, checked by loading them on a real test server.
- Assets: 16x16 pixel-art textures, block, item and entity models, GeckoLib animations, sounds and translations.
- Crash fixing: send a crash report or latest.log and the coder finds the mod and the cause. Fixes come as your own compat mod, config or data change, never a patched copy of someone else's mod.
- Every jar you get was rebuilt from source by the box and ran its GameTests there, with the source zip next to it.
- Nothing from Mojang leaves the box: every delivered file is checked against the game's own files.
- Send a video clip and the coder reads its frames.
A turn, start to finish
One message in, files out. Open "Show the steps" in the workbench to follow every command the coder runs.
Honest about testing
Jars are AI-built and not reviewed by a person: scan them before you share them. Publishing on Modrinth? Its rules require the "Contains AI-generated content" disclosure and refuse projects made entirely or mainly by AI.
You
Add a ruby ore that generates underground, with ruby tools. Fabric, 26.3.
Coder
Show the steps 6
- Started from the Fabric 26.3 template
- Wrote the ore, the items, the tools and the worldgen
- Generated models, recipes and loot with datagen
- Built with Gradle in the sandbox: success
- GameTests: passed
- Rebuilt the jar from source and checked it for Mojang files
Done: ruby ore, ruby and five ruby tools. The box rebuilt the jar from source and its GameTests passed.
rubyore-1.0.0.jarrubyore-1.0.0-sources.zip
Not tested in game.
NOT AN OFFICIAL MINECRAFT SERVICE. NOT APPROVED BY OR ASSOCIATED WITH MOJANG OR MICROSOFT.
Every coder works on Minecraft
Pick a coder in the workbench and switch between them in the same session. Luka's top three:
Google
Gemini 4
gemini-4-argon“As strong as GPT-6 Astra, half the price of Opus, and twice as fast. Do I need to say more?”
Luka
OpenAI
GPT-6 Astra
gpt-6-astra“The best in the GPT family, but still too expensive. Opus is better and cheaper, in my opinion.”
Luka
Other games
Start with one message
Open the workbench, pick a game and a coder, and describe the change you want. Your Astropond login and balance work here.