GPT-5.4 Mini for Voice AI: The Low-Latency Solution Developers Need
SMRTR summary
GPT-4o Mini and similar real-time-optimized models are transforming voice AI by achieving sub-200ms time-to-first-token, enabling natural conversations with under 500ms total latency. The article demonstrates building a working voice assistant using OpenAI's Real-time API, comparing architectural approaches like speech-to-speech versus traditional speech-to-text-to-speech pipelines, and analyzing when to choose mini models over larger alternatives.
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