https://claude.ai/artifact/R4anJpJEUv9oQZXLSVKpHf I had one AI build a game and a second AI check its work. Here's how it went and what it cost. I wanted a teaching game for tradespeople about organizing job files for AI. I didn't write it by hand, and I didn't have my main AI write it either. I split the work: - Claude was the planner and the checker. It wrote the briefs, built the tests, and reviewed everything. - DeepSeek was the builder. It wrote the bulk, on its own cheaper meter, in a copy of the files and never in my real folders. What came out: four versions of a 25-level game (electricians, plumbing and HVAC, general contractors, and a free base version), a program outline, and a drafted 8-episode series with 24 Shorts. It ran unattended for under an hour. The part that made it work was the checker. I didn't take DeepSeek's word that it was done. Claude wrote a hidden checker that DeepSeek couldn't see or edit. It loaded the real game and checked that: - the game code was unchanged except for the wording - no leftover names from the old version remained - every level still gave the right answer - the hardest levels were still winnable When a build failed, the checker's output went straight back to DeepSeek for another try. The base game passed on the first try. The three trade versions took 3, 2 and 3 tries. Where it went wrong, and what that taught me: - DeepSeek's first draft of the video scripts was wrong about its own game. It quoted a line the robot never says and described a button that doesn't exist. - So I ran the real game to get the exact facts for every level, had DeepSeek rewrite against those facts, and checked it again. Every quote and number in the scripts is now real. - I also found a small bug in the game itself ("1 files"), fixed it, and re-ran the checks. The cost, honestly: - I'm on a flat plan, so nothing extra was billed on my side. The whole thing barely moved my usage meter. - DeepSeek's exact bill isn't logged on my machine, so I only have estimates. My guess is a few million tokens, mostly reading across the retries. That's a small amount at its prices. - If my main AI had written all four games and the scripts itself, I'd estimate several hundred thousand output tokens of the expensive kind, spread over multiple usage windows. - It wasn't free: the checker, the fact-checking pass and my own reading were real work. The saving is that the bulk typing went to the cheaper meter.