The previous ChatGPT voice mode was based on an aging, relatively weak GPT-4o era model with a 2024 knowledge cutoff, which limited its usefulness as a brainstorming partner enough that the author had mostly stopped using it.

Simon Willison explains he'd largely abandoned voice mode because the underlying GPT-4o era model was outdated and weak. ✦ AI generated

Simon Willison · Simon Willison's Weblog · 2026-07-08 · original ↗

The previous voice mode in the ChatGPT app was based on a GPT-4o era model, with a knowledge cut-off some time in 2024. I had mostly stopped using voice mode because the age and relative weakness of the model greatly limited how useful it was as a brainstorming partner.

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