ChatGPT voice mode is a weaker model
BlogSimon WillisonApr 10, 2026
AI Summary
Non-obvious fact: ChatGPT voice mode runs a GPT-4o-era model from April 2024, while Codex works for hours on complex tasks. Paired with Karpathy thread explaining why verifiable domains (code) get disproportionate training attention vs writing/voice.
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Sponsored by: Honeycomb — AI agents behave unpredictably. Get the context you need to debug what actually happened. Read the blog I think it's non-obvious to many people that the OpenAI voice mode runs on a much older, much weaker model - it feels like the AI that you can talk to should be the…
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