Dated, sourced reference tables on personal AI writing: what each assistant stores about your voice, how much writing each one ingests, and the stylometric datasets behind MyWritingTwin.
Of the major AI assistants, only Claude publishes a feature that builds a style from a sample of your own writing; ChatGPT, Copilot and Gemini personalise from instructions you write yourself, which means the style information is your self-description rather than a measurement.
Last updated 2026-09-15
Most AI assistants ingest none of your writing to build a style — they read a description you type — so the practical comparison is between tools that accept a writing sample and tools that accept only instructions.
Last updated 2026-09-15
A style profile goes in the highest-scope field that matches how widely the voice applies: account-level settings for what is true of all your writing, and project or Gem instructions for what is true of one audience.
Last updated 2026-09-15
This dataset is the per-language list of function words, hedges, boosters and attitude markers MyWritingTwin uses for stylometric analysis, covering English, Japanese, French, Spanish and German.
Last updated 2026-09-15
This dataset gives the average stylometric profile of AI-generated text per language, measured from 320 samples across 5 models, 4 locales and 8 prompt types, and it is the baseline a human writer's profile is compared against.
Last updated 2026-09-15