For people who can't afford to guess
Most AI sounds confident whether it's right or wrong. Tatsulok answers from your own documents and puts a citation on the answer, click it and the exact source passage opens, highlighted. Verification takes seconds, not a re-read.
Free plan. No credit card. Works in English and Japanese.
What cited answers look like
A real 2026 paper, a real question, a cited answer. Tap a number to read the line it came from, then open that page of the original PDF.
You ask
How does this paper define hallucination, and what happened when they combined instruction-based refusal with a structural gate?
Tatsulok answers
The authors treat hallucination as a misclassification at the output boundary: the model emits internally generated text as if it were grounded in evidence . They distinguish evidence-backed generation (supported by the user's data, retrieved passages, or citations) from prior-only generation . Combining instruction-based refusal with a structural abstention gate reached 96-98% accuracy and 0-4% hallucination across the models they tested .
Sources
The paper above is real (Hintsanen 2026, CC BY 4.0). The tabs below are illustrations of the same citation behavior on other kinds of files.
You ask
What does our vendor agreement say about termination?
Tatsulok answers
Either party may terminate if a material breach isn't cured within 30 days of written notice 1. The customer also holds a convenience-termination right after month 18, with 90 days' notice and a fee of 40% of remaining committed fees 2.
Sources
Answers you can verify beat answers you have to trust.
Ask your own documentsUpload files or whole folders, contracts, reports, research, policies, spreadsheets. Tatsulok indexes them privately for your workspace.
No prompt engineering. Ask the question the way you'd ask a colleague who had read everything.
The answer carries numbered citations. Click one and the source file opens at the exact passage, highlighted, so checking the answer takes seconds.
Language models sound equally sure when they're right and when they're hallucinating. A citation converts "trust me" into "see for yourself."
Answers are grounded in the files you provide, your contracts, your data, your research, not a public model's guess about the world.
Citation-first research tools exist for academic papers. Tatsulok brings the same verifiability to every document your work actually runs on, contracts, reports, policies, notes.
Your documents stay in your workspace. They aren't used to train models, and access is controlled per project and team. Verifiability and privacy are the same promise: you stay in control of the evidence.
Read about trust and privacy