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Large Language ModelsAudio & SpeechSimon Willison's WeblogPublished: Apr 11, 2026, 01:00 JST1 min read

OpenAI's ChatGPT voice mode reportedly uses a less capable underlying model than the text-based version

OpenAI's ChatGPT voice mode reportedly uses a less capable underlying model than the text-based version

3 Key Points

  1. ChatGPT's voice interface appears to be powered by a weaker AI model compared to the standard text-based ChatGPT

  2. This performance difference may impact the quality and capabilities of voice conversations

  3. The distinction raises questions about OpenAI's technical architecture and optimization choices for different interfaces

  4. Users may experience differences in reasoning ability and response quality between voice and text modes

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