Claude

It depends on your primary tasks. If you need to process ultra‑long documents, write polished Chinese prose, or dive deep into code understanding and refactoring, Claude is usually the smoother choice. For a broader feature set, larger ecosystem, and general-purpose use, ChatGPT may be preferable. Many users try both free versions for a week on their real workloads before deciding. In practice, people often pay for both: Claude for writing and long‑form work, ChatGPT for miscellaneous tasks and quick searches.

The main advantage is that you don’t have to split the text yourself. Chunking breaks context, and many issues—like whether a definition in Clause 3 conflicts with a penalty in Clause 20, or if quarterly statements in a financial report contradict each other—only become apparent when the entire document is considered. Reading the whole thing at once lets you ask those critical questions.

AI‑detector accuracy is itself controversial, with high false‑positive rates that shouldn’t be the sole basis for judgment. A pragmatic approach is: regardless of the tool, always review, rewrite, and add your own examples and insights. Pure copy‑and‑paste, even if undetected, reads hollow—this is the real issue.

The key is data‑processing terms. Consumer plans and enterprise plans differ in whether data is used for model training. If you’re handling customer data or trade secrets, choose the enterprise plan. Taiwan’s personal data law also imposes requirements on cross‑border data transfer, so have legal review the terms and data‑processing agreement before deployment.