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Telnyx SMS now uses an LLM to detect unsubscribe intent in inbound messages, going beyond fixed keyword matching to catch natural-language opt-out requests like "don't message me again," "leave me alone," or "please stop texting," and handles them exactly like a standard STOP.
Traditional SMS unsubscribe relies on fixed keywords like STOP, END, or UNSUBSCRIBE. Real recipients don't always use those exact words. They say "don't text me," "take me off this list," or use language that keyword filters miss entirely. For high-volume SMS programs, missed opt-out requests mean continued messaging to recipients who asked to stop, which creates compliance risk and damages sender reputation. LLM-based detection catches the intent behind the words, not just the words themselves, so opt-out requests get honored regardless of phrasing.
features.ai_opt_out_detection_enabled to true.
Learn more in the advanced opt-in/out guide or the messaging profile API reference.