Every AI Model
Has a Tell.

Every model is trained on a specific data distribution with specific feedback signals. ChatGPT was trained with RLHF feedback that rewards helpful-assistant behavior, which produces hollow affirmations and formulaic structure. Claude was trained to reason carefully, which produces meta-commentary and reflexive hedging. DeepSeek is optimized for analytical tasks, which produces academic register and enumerated structure. The patterns are not failures. They are the model performing well at what it was trained to do. In finished copy for a professional context, those same behaviors become signals.

Each model has consistent fingerprints. ChatGPT drafts open with hollow affirmations and default to bullet structure. Claude drafts use em dashes throughout and include meta-commentary about the content. Gemini drafts use headers for content that should be prose and end with a summary that restates the opening. DeepSeek drafts have extended preambles and numbered sections. Grok drafts shift register unexpectedly. Perplexity drafts cover everything comprehensively and attribute claims to sources. You do not need certainty. Define the patterns you can see and HumanTone removes them.

Yes, and this is where the accuracy improvement comes from. A generic instruction removes surface markers. A targeted instruction removes the actual patterns. The difference is in what Custom Instructions specify: hollow affirmations for ChatGPT, em dashes for Claude, header defaults for Gemini. An instruction built for ChatGPT targets hollow affirmations, formulaic openers, and hedging phrases precisely. An instruction built for DeepSeek targets academic register, passive constructions, and numbered section defaults. The right instruction set removes what the model actually does, not just what AI writing generally does. Save a profile for each source you use regularly and apply the right one to each document.

No. HumanTone preserves core message and intent. Targeted rewriting addresses structural and stylistic patterns: how claims are framed, how sections are organized, what transitional language is used. The substance stays. What changes is the phrasing, the structure, and the register. Use Custom Instructions to specify any terms, phrases, or names that must remain unchanged and HumanTone will not alter them.