AI hallucination has two sides: what the model knows, and what the model can check.
Knowledge is hard. The best frontier model in 2026 scores 43 out of 100 on open-domain factual knowledge. Reasoning models made it worse. o3 hallucinates at 33% compared to o1's 16%. Nobody has solved this yet.
Verification is easy. A command exists on your machine or it doesn't. A path is real or it isn't. These aren't opinions. They're facts you can look up before the command runs. Claude Code doesn't look them up.
Check does. It reads your machine before the AI reasons and validates every command before it runs. Two hooks. Nothing in your project.
We build tools that sit between AI and the places it touches. Check is the first. It handles the verification side because that's the side we can actually solve. We're not trying to make models smarter. We're trying to make the environment honest enough that smart models stop guessing.
We tested it twice. Once it scored 41% higher. Once the AI reviewing itself said it made no difference. We published both, along with four declared biases and three ways to falsify the results. That's how we think companies should ship.
Full literature review, case studies, and methodology at golproductions.com/research.
120 free checks a day. No signup, no card. Windows, Claude Code, Node 18+.
npx @golproductions/check@latest --install
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