PIG-Demo

Interactive demos of reinforcement-learning environments, built for people who sign the budget rather than write the training loop.

https://demo.primeintellectgrowth.com

An environment is four things: a task, a set of legal moves, a grader that cannot be argued with, and a score that moves. Every demo here renders those four boxes, plays a real recorded rollout against them, and then lets you change what "good" means and watch the ranking flip.

Sibling project to PIG.

---

Why a word game first

Because it is Prime Intellect's own hello-world, and that is checkable in three public repositories in about thirty seconds:

• one of five basic examples in prime-rl
• an environment in verifiers
• the environment used in the official lab-cookbook GEPA prompt-optimisation tutorial

We didn't pick a game. We picked theirs.

It also needs zero domain knowledge, which means an executive learns the machine — task, moves, grader, score — before any vertical vocabulary gets in the way. Every demo after it renders the same four boxes with a different grader.

What is actually in here

envs/wordle_five/     A real environment: engine, reward, reference solver, tests
envs/probe.py         The ladder that proves the reward measures something
src/demos/wordle/     The browser half — a port of the same engine
public/traces/wordle/ Recorded rollouts, committed. The evidence.

The site does no live inference. Rollouts are captured once against a real model and replayed at their recorded wall-clock. That is a deliberate choice: a public demo with no auth cannot hold an API key, a live call is slow and flaky on conference wifi, and a recorded run can be scrubbed, permalinked, blind-compared and verified in ways a live one cannot.

What keeps it from being a video is that the browser re-derives every number it shows. It re-runs the recorded moves through its own copy of the engine, rescores them, and prints the delta against what the environment recorded.

The three commands that check the claims

uv sync --all-packages
uv run pytest envs/wordle_five/tests   # 25 tests, incl. the duplicate-letter cases
uv run python envs/probe.py            # the reward ladder, 7 hard assertions
pnpm install && pnpm check && pnpm build

The cross-language gate

engine.py and engine.ts must agree on every tile. CI scores all 4,603² = 21.2 million (guess, answer) pairs through both and compares a SHA-256:

69f4e8dfbdc492176d7b7f04b080d8d3cccb5f18aca2d592e622938a5aeec8e2

A hand-picked vector file only ever catches the cases somebody thought of. This catches all of them, and it is what lets the page claim it verified a run.

The subtlety it protects is the duplicate-letter rule. Scoring runs in two passes — every green in the word is resolved before any yellow is assigned — because a letter may be marked non-grey at most as many times as it occurs in the answer, and greens have first claim. SASSY against BASIS is YGGXX: three S's guessed, two available, so one yellow and one grey. Getting this wrong is the most common bug in implementations of this game, and it is the bug that put a correction video on the most-watched explanation of it ever made.

The reward, and why the third component is the point

component	weight	role	measures
solved	0.50	objective	did it win
economy	0.30	objective	turns used, as a ratio against the reference player on the same word
consistency	0.20	counterweight	share of turns spent on a move that could still have won

A counterweight has to be in genuine tension with the objective, or it is a gate wearing a counterweight's name. This one is: a player maximising information deliberately guesses words that cannot win, because a word splitting the candidates evenly teaches more than a word that might happen to be right. That is good play, and it costs consistency.

The probe ladder measures the trade rather than asserting it:

policy                solved       economy   consistency     TOTAL
inaction              0.0000        0.0000        0.0000    0.0000
crude                 0.0000        0.0000        0.0556    0.0111
plausible             0.1250        0.1000        0.1493    0.1224
candidate_only        0.9375        0.7458        1.0000    0.8925
exhaustive            1.0000        0.9375        0.6094    0.9031
oracle                1.0000        1.0000        0.7292    0.9458

The two good policies are 0.05 apart and neither dominates the other. Which one wins is a decision about what you actually want — which is the whole argument this site exists to make, and it is why the reward editor on the page can flip the ranking with one slider. probe.py fails CI if either policy starts dominating, if any weighted component goes flat, or if doing nothing scores above zero.

Honesty

• Every rollout is recorded, not live, and labelled as such on the page.
• The reward editor re-scores recorded attempts. It does not retrain anything, and it says so where you use it.
• The word list is our own construction from Wordnik (MIT) and SCOWL. Our answer pool is 4,603 — roughly twice the original game's — so this is harder than the original and our numbers are not comparable to published figures for it. The famous SALET / 3.4212-guess optimum belongs to that list, not ours, and is cited as such.
• The verticals listed on the site are our proposals. They are not Prime Intellect's roadmap and not a customer list. No customer logos, ever.
• Not affiliated with The New York Times. Independent implementation, own word lists, own palette, own reward.

Full accounting: demo.primeintellectgrowth.com/honesty

Also served at demo.lumbridgecorp.com; the canonical name is the first one and every page says so in its <link rel=canonical>.

Adding a demo

pnpm demo:new <slug>

The full recipe — specification, environment, port, capture, page — is in .claude/skills/new-environment/SKILL.md, and .claude/workflows/new-environment.js runs it as a pipeline with adversarial review between the stages. The specifications for the eleven environments not yet built are already written, in src/content/verticals.ts.

Copies the templates and wires nothing — the registry finds demos by existence, so the header, the gallery, the router and the sitemap all pick it up with zero edits to shared files. pnpm check enforces the contract; see CONTRACT.md.

Licence

Apache-2.0. Third-party attributions in NOTICE.