0564GitHub
Jev plays Pokémon Red through a legal-action harness
Jev selects battles, destinations, team changes, and menu actions from game state while an emulator harness handles movement and button presses.
Public harness code and the completed-run report were inspected on October 1, 2026. The builder reports finishing in 37 hours 40 minutes using 16,150 decisions and approximately $1.65 of Jev input tokens. The harness reads game memory, supplies legal options and game facts, and handles pathfinding and menus; it does not write game memory. Cost covers Jev calls rather than all infrastructure. This run has not been independently reproduced.
christianmat/jev-pokemonREADME ↗
# Jev Plays Pokémon Red
[Jev](https://en.wikipedia.org/wiki/Jev_(AI_model)), TypeSafe AI's decision model, plays Pokémon Red. There are no scripts or cheats: the harness reads the game's memory, lists the legal options with some facts about each, and Jev picks one.
Landing page: [jev-pokemon.vercel.app](https://jev-pokemon.vercel.app) ([`site/`](site/))
## Result
Jev beat the game. The live stream ran on YouTube from Sep 25 to Sep 26, 2026 and has ended. The highlights are on the landing page.
| | |
|---|---|
| Total time | 37h 40m |
| Decisions made | 16,150 |
| Input tokens | ~39.2M |
| Total Jev cost | ~$1.65 |
| Median decision time | ~0.4s |
| Team wipes | 16 (14 at the Elite Four) |
| Elite Four attempts | 15 |
| Final team | Charizard 83, Graveler 62, Nidoqueen 45, Beedrill 44, Haunter 39, Primeape 29 |
> You need your own legally obtained copy of Pokémon Red. No ROM is included or distributed here. See [Legal](#legal).
## How it works
```
Game Boy emulator (Node) ──► read RAM ──► game state (map, party, battle, on-screen text)
▲ │
│ button presses ▼
harness mechanics ◄── Jev picks one ◄── legal options + facts
(A* pathfinding, menus) (type matchups, damage estimates,
"2 areas toward the objective", ...)
```
- **Jev decides:**
- every menu answer (names, starter, YES/NO, shop, heal, learn/forget moves)
- what to focus on (progress, heal, train, catch, shop, explore, team)
- which Pokémon to catch, and which to swap in and out of the team at the PC
- where to go and who to talk to
- every battle action (move, switch, item, ball, run)
- **The harness never decides:**
- It only reads memory and p