{"version":1,"type":"story","url":"https://digestai.news/story/chatgpt-free-version-answers-japanese-tax-expense-questions-correctly","json":"https://digestai.news/story/chatgpt-free-version-answers-japanese-tax-expense-questions-correctly.json","markdown":"https://digestai.news/story/chatgpt-free-version-answers-japanese-tax-expense-questions-correctly.md","slug":"chatgpt-free-version-answers-japanese-tax-expense-questions-correctly","headline":"ChatGPT free version answers Japanese Tax expense questions correctly in Trial","summary":"A sole proprietor in Japan tested the free, no‑login version of ChatGPT on ten textbook‑level tax expense questions. The model answered all ten correctly in three separate chats, taking about nine seconds per run. The author compared this result to a recent overseas study by fintech firm Saturn, which asked 18 AIs—including ChatGPT, Claude and Gemini—121 finance‑related questions. That study found an overall 43% accuracy rate, with free models getting 63% of answers wrong and paid versions 49% wrong; on complex queries the error rate rose to 88%.\n\nIn the author’s trial, ChatGPT correctly labeled national health insurance as a deduction rather than an expense and identified the updated blue‑return provision that allows full expensing of assets under ¥400,000 purchased after 1 April 2026, even though the question was based on the older ¥300,000 limit. The author concludes the free version is sufficient for basic expense checks, but advises consulting the tax office or a professional accountant for nuanced or complex matters.","keyPoints":["Free ChatGPT answered all ten Japanese tax expense questions correctly in three trials, taking about nine seconds each","Saturn’s study of 18 AIs on 121 finance questions showed 43% overall accuracy; free models were 63% incorrect, paid models 49% incorrect, and 88% wrong on complex queries","ChatGPT correctly noted the updated blue‑return expense limit (under ¥400,000 after 1 April 2026) despite the author using the older ¥300,000 threshold"],"whyItMatters":"Shows that a free large‑language model can reliably handle basic tax expense verification for small businesses, reducing reliance on paid tools while highlighting limits on complex financial advice.","category":{"slug":"marketing","name":"Marketing & Small Business","url":"https://digestai.news/category/marketing"},"entities":{"companies":["OpenAI","Anthropic","Google","Saturn","National Tax Agency"],"models":["ChatGPT","Claude","Gemini"],"people":[]},"firstPublishedAt":"2026-09-25T20:01:00Z","updatedAt":"2026-09-25T20:01:00Z","sourceCount":1,"hasPrimarySource":false,"sources":[{"outlet":"note.com","title":"[Trial #03] 10 Expense Determination Questions via Free ChatGPT -> 10/10 Correct 3 Times in a Row","url":"https://note.com/trieditforyou/n/n1cd965e7f269?hl=en","publishedAt":"2026-09-25T20:01:00Z","type":"press","primary":false,"lead":true}],"sourceNotes":null,"discussions":[],"thread":null,"cite":{"text":"Digest AI, \"ChatGPT free version answers Japanese Tax expense questions correctly in Trial\", 25 September 2026, https://digestai.news/story/chatgpt-free-version-answers-japanese-tax-expense-questions-correctly","publisher":"Digest AI","title":"ChatGPT free version answers Japanese Tax expense questions correctly in Trial","datePublished":"2026-09-25T20:01:00Z","url":"https://digestai.news/story/chatgpt-free-version-answers-japanese-tax-expense-questions-correctly"},"generatedBy":"Written by Digest AI's editorial model from the linked sources; the sources are the record.","license":"Headlines, digests and key points are written by Digest AI and may be quoted with a link to the story page. Linked articles belong to their publishers. Terms: https://digestai.news/terms#reuse"}