Had Claude Opus 5 build me a Jev like System One that runs

@JA1MEXD3ZTR0Y3R high-meh · Sep 18, 2026 · case #076706 · listed via Jev Hub

Still from the clip posted with this case; watch it in the original post on X.

Had Claude Opus 5 build a local Jev-like System One, patching the Fallout 2 engine so Gemma 4B receives game state and decides combat, dialogue and inventory actions.

The original post

Had Claude Opus 5 build me a Jev like System One that runs fully local. Gemma 4B is playing Fallout 2 on my laptop . Claude patched the open source Fallout 2 CE engine so the game feeds it real state combat, dialogue, exploring, inventory etc. #Fallout2 #ClaudeCode @AnthropicAI

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Numbers are a snapshot taken from X when the case was added to the library (schema v1, collected 2026-09-19); they will not match today.

Where this case fits

Filed under games & playable demos. In the pattern Jev is built for, the model answers a bounded question per step — and ordinary code acts on the answer, because the answer is already a value rather than a paragraph. Other posts in the same family are on the games & playable demos page.

🎮 Games & playable demos