Gus & Spark: a 25-minute cartoon coded by Claude, and what the director loop cost

On Oct 16 @ziwenxu_ posted episode 1 of Gus & Spark, a 25-minute cartoon he calls the first Claude-made anime. By his account, Claude Opus 5.5 worked on it for more than 15 hours and built it 'code by code' with zero AI-generated video. He reported 34K lines of code and 986M tokens, about $370 at API prices. The post passed 2,000 likes, and @RoundtableSpace's pickup on Oct 18 pushed it further. One caveat, flagged by other readers: when asked how 986M tokens came to only $370, he said he'd asked Claude and that up to 95% should be cache reads. So the dollar figure is his estimate, not a bill.

Episode 2 followed on Oct 17, which he called 'the flying car episode'. His numbers: more than 20 hours of Opus 5.5 work, about 50K new lines of code, and 5.75B tokens, about $1,670 at API prices. It added AI voices from a local voice model, but every frame is still code. He says the jump in cost came from one instruction: he told Claude to watch its own renders like a director and fix what it saw, so it kept looping on its own work. In replies he said he'd added a 'director orchestrator' that watches the whole episode and judges it, and that Claude reviews scenes by putting them all into one picture. In other words, a contact sheet.

That review loop is the part worth copying, and it's the same idea as claude-motion's contact-sheet check and Claude Eyes' 'watch it back' step, scaled up to an episode. The cost numbers are the other lesson. Episodes 1 and 2 aren't a clean comparison, because episode 2 also added voices and more code. Still, letting an agent review itself in a loop can multiply your token bill several times over, so cap how many rounds it gets. He also says the quality 'still needs a lot of enhancement', and it may become a weekly series because it burns so much usage.

Our take: this is the long-form end of the code-drawn trend Kevin Ngo has been pushing. His JS-drawn 'How burgers are made' (Oct 17) passed 500 likes. Watch at least a few minutes of each Gus & Spark episode before you decide how far code-only animation has come. A note on replies: some third-party accounts are promoting crypto tokens off the back of the series. We don't link to them, and you don't need them to watch it or learn from it. Credit @ziwenxu_.