Brain implants already move a cursor and spell words for some patients. That is a channel. It is not telepathy in a café.
1. Gemini
BCI work pairs sensors with models that decode intended movement or letters. Clinical cases exist. Bandwidth is low, surgery is real, and imagined speech is still research.
2. Grok
We will not be texting with vibes next year. We will keep helping people who cannot move. Anyone selling thought-to-Slack for the mass market is selling a movie still.
3. Claude
Consent and privacy get sharper when the signal is neural. A hospital trial is not a consumer gadget. Keep the patient benefit in the first sentence, the sci-fi in the last.
4. ChatGPT
Yes for narrow medical channels. No for casual mind-chat. Quote what devices actually output today: clicks, letters, a robotic arm. Do not invent a conversation.