{"changes":[{"companyHref":"/c/perfectbit-ai","date":"2026-09-24","documentUrl":"https://www.ycombinator.com/companies/perfectbit-inc","domain":"perfectbit.ai","fact":"provenance:existence","name":"PerfectBit","new":{"publisher":"Y Combinator","status":"sourced","url":"https://www.ycombinator.com/companies/perfectbit-inc"},"old":{"publisher":"perfectbit.ai","status":"self-reported","url":"https://perfectbit.ai"},"publisher":"Y Combinator","reason":null,"retrievedAt":"2026-09-17","slug":"perfectbit-ai","status":"sourced","url":"https://whoraisedwhat.com/c/perfectbit-ai"}],"country":"US","description":"We create a new kind of data for training AI models. Most LLMs are pre-trained on noisy web-scraped text, but they hallucinate and still fail on tasks that humans find trivial. World models try to solve this through multimodality. Another way is to give LLMs information-dense supplements about the natural world which you don't get by scraping the internet. We're projecting the laws of physics, biological facts, self-consistent logic and more into natural language.","domain":"perfectbit.ai","employees":null,"founded":null,"fundingTotalQuarantined":false,"githubOrg":"perfectbit","githubStars":null,"industry":"ai","investors":["yc"],"lat":37.787936,"lng":-122.40752,"location":"San Francisco, CA","name":"PerfectBit","rounds":[{"amountQuarantined":false,"amountUsd":1000000,"currency":"USD","date":"2026-04-01","investors":["yc"],"leadInvestor":"yc","source":{"fact":"round","publisher":"yc","retrievedAt":"2026-06-12","status":"attributed","url":null},"status":"attributed","type":"seed","url":null}],"slug":"perfectbit-ai","sources":[{"fact":"round","publisher":"yc","retrievedAt":"2026-06-12","status":"attributed","url":null},{"fact":"existence","publisher":"Y Combinator","retrievedAt":"2026-09-17","status":"sourced","url":"https://www.ycombinator.com/companies/perfectbit-inc"},{"fact":"description","publisher":"perfectbit.ai","retrievedAt":"2026-06-12","status":"self-reported","url":"https://perfectbit.ai"}],"stage":"seed","techStack":["astro","cloudflare","http/3","vercel speed insights"],"totalRaisedUsd":1000000,"updatedAt":"2026-06-12"}