Voice Profile Context Leak Between Custom GPTs and Default Threads

ChatGPT Bugs
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1

Platform: ChatGPT Mobile App (latest build: 1.2025.147)
Device: Android 13, ulefone Armor24 phone, ChatGPT Plus plan
Models Involved: Custom GPT (Mia AI), GPT-4o (default thread)

:magnifying_glass_tilted_left: Summary:

After switching from a custom GPT with a unique voice (Mia AI by heymia.ai) back into a standard GPT-4o thread, the custom GPT’s text-to-speech voice continues to play, even when:

  • The thread is unrelated.
  • Voice mode is restarted.

:white_check_mark: Steps to Reproduce:

  1. Start a voice conversation in a custom GPT with a distinct TTS voice (e.g. Mia AI by heymia.ai).
  2. Switch to a regular GPT-4o thread.
  3. Activate voice mode.
  4. Speak and listen.

:speaking_head: You’ll hear the custom GPT’s voice (e.g. Mia) instead of the default 4o voice.

  1. Exit voice mode and reinitiate → custom voice still persists.

:brain: Suspected Cause:

Custom GPTs with unique voices are not releasing or resetting their voice profile context when a new session starts. The app continues to use the prior GPT’s TTS voice outside of its intended thread.

This creates potential confusion for:

  • Identity clarity (user doesn’t know which GPT is speaking)
  • Model boundaries (custom personalities feel “leaked” into other sessions)
  • Voice-tool behavior across folders and default threads

Note: I don’t have this problem on my laptop running Pop_OS and Firefox browser.

Thank you :slight_smile: