[Bug Report] Audio Chat wipes entire chat history and locks model switching

Environment

  • Platforms: iOS ChatGPT App, Chrome & Safari (Web)

  • Model: GPT-5 (bug appears only after release)

  • Period observed: February 2025 onwards

Problem Overview
When an Audio Chat session is started inside an existing text conversation, the entire previous chat history in that thread becomes inaccessible.

Reproduction Path

  1. Open an ongoing conversation with multiple turns of text.

  2. Start Audio Chat (tap microphone).

  3. End Audio Chat and return to text view.

  4. Observe: only the very first user message remains. Everything else is replaced with GPT’s audio-transcribed replies. User’s own audio input does not show.

  5. Model switching becomes unavailable in that thread (“audio not supported”).

Expected

  • Audio Chat should function as an optional overlay, without altering or deleting past conversation history.

  • Text messages must persist regardless of Audio Chat usage.

Impact

  • Two important threads already affected, including one containing critical work.

  • Other conversations (with Audio Chat before GPT-5 release) remain intact.

  • Issue reproducible consistently on iOS and Web.

  • App reinstallation / refresh does not restore history.

Support References

  • Case Numbers: 500VU00000WieCIYAZ, 500VU00000WmSfbYAF
    (Multiple replies submitted, but responses seem not received by support.)

Main Request

  1. Confirm whether this is a known GPT-5 Audio Chat bug.

  2. Assist in recovering the lost chat history (critical work content).

  3. Provide fix timeline or workaround (e.g., disable Audio Chat from overriding text history).