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ChatGPT voice mode is a weaker model

sourceSimon Willison
calendar_todayApril 10, 2026
schedule2 min read
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EXECUTIVE SUMMARY

Understanding the Limitations of ChatGPT's Voice Mode

Summary

The article discusses the limitations of OpenAI's ChatGPT voice mode, highlighting that it operates on an older, less capable model compared to other advanced offerings. It emphasizes the disparity in AI capabilities based on the model's application and context.

Key Points

  • OpenAI's voice mode is based on a much older model, referred to as GPT-4o.
  • The voice mode inaccurately claims its knowledge cutoff date as April 2024.
  • The article references a tweet by Andrej Karpathy regarding the misunderstanding of AI capabilities across different access points.
  • OpenAI's Codex model is noted for its ability to restructure code and identify vulnerabilities effectively.
  • The effectiveness of models like Codex is attributed to explicit reward functions that are easier to measure.
  • Business-to-business (B2B) applications receive more focus and resources for improvement compared to consumer-facing models.

Analysis

The article sheds light on the significant gap in AI capabilities between different models offered by OpenAI. It underscores the importance of understanding the context in which AI models operate, especially for IT professionals who may rely on these tools for critical tasks.

Conclusion

IT professionals should be aware of the limitations of AI models like ChatGPT's voice mode and consider utilizing more advanced models, such as Codex, for tasks requiring higher accuracy and capability. Understanding these differences can lead to better decision-making in AI tool deployment.