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AI Services for Legal / Attorney that Solve "Legal Review of Contracts"

Missing something in a contract review can lead to serious risk, yet the more matters you're handling, the less time you have to spend on each one. Using AI for a first-pass check can improve both the speed and thoroughness of review. This page compares tools useful for legal contract checking.

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チャット ジーピーティー

ChatGPT

ChatGPT is an AI assistant provided by OpenAI, the conversational service at the center of the generative AI boom. The desktop app has moved to a new app that combines Chat, Work, and Codex, and the previous version, "ChatGPT Classic," will be discontinued on January 30, 2027 (chat history carries over). Since October 2026, Chat runs on GPT-6 (GPT-6 Sol on paid plans, GPT-6 Luna on Free and Go), and the new Intelligent UI builds charts, buttons, forms, and small tools into answers. With the Chrome extension, Chat can read your open tabs and Work can operate them to fill out forms, send messages, and download files (all plans). In ChatGPT Work and Codex, you can also choose GPT-6.1 Sol (September 2026) and GPT-6.1 Terra (October 26), which excels at reading images and computer use and costs half as much as Sol on the API (input $1 / output $5 per 1M tokens) (Plus and above). ChatGPT Slides lets you create and co-edit decks in real time (Pro, Business, Enterprise). On November 10, 2026, Business Hub launched in beta, letting companies manage their information and check metrics such as mentions. It also offers Deep Research, image generation, data analysis, voice conversation, and a coding agent (Codex), plus projects, scheduled tasks, custom GPTs, and workspace agents. Pricing is free / Go ¥1,400 / Plus ¥3,000 / Pro ¥16,800– (individual, monthly), with Business and Enterprise for organizations.

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Using AI as a First-Pass Screen to Reduce Oversights

Manually catching every unfavorable clause or deviation from a standard template in a contract review is a heavy burden. Having AI flag high-risk clauses at the individual-provision level lets reviewers start with the most important issues and work through them with fewer gaps. That said, AI's flags are only a preliminary screen — the final legal judgment and decision on how to revise the contract must be made by a lawyer or other qualified professional.

Points to Compare Between Contract-Checking Tools

  • Is accuracy consistent across different contract types (service agreements, NDAs, sales contracts, etc.)?
  • Does it cite the basis for its flags (the specific clause, relevant case law, etc.)?
  • What security and data-handling practices are in place, given that confidential internal information will pass through it?
  • Can it export flagged results in a format that's easy to hand off to a lawyer for review?