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View Pricing Details →Pricing sourced from Ultravox · Last verified March 2026
Both are speech-native multimodal systems, but Ultravox is priced at $0.05 per minute on its managed cloud compared to a higher per-minute rate for GPT-4o Realtime. Ultravox also ships open-weight models you can self-host and offers direct WebRTC and SIP telephony integrations. GPT-4o Realtime has broader general knowledge and tighter integration with the OpenAI ecosystem.
In a traditional pipeline, audio is first transcribed to text (ASR), sent to an LLM, and then re-synthesized to speech (TTS). Each hop adds latency and discards paralinguistic cues like tone, pace, and emotion. Ultravox's speech-native model processes audio tokens directly, preserving those cues and cutting end-to-end latency.
Yes. Ultravox publishes open-weight models on Hugging Face, so teams with HIPAA, GDPR, or air-gapped requirements can run inference in their own VPC or on-premise GPUs. The managed cloud API is also available for teams that prefer not to manage infrastructure.
Ultravox targets sub-300ms time-to-first-token under typical network conditions, which is the threshold where turn-taking starts to feel genuinely conversational. Real-world end-to-end latency depends on network conditions, TTS selection, and tool-call complexity.
Teams that want to own their voice stack — customize prompts, swap TTS voices, self-host for compliance, or optimize per-minute costs — tend to choose Ultravox. No-code builders are better for teams that prioritize speed to launch over infrastructure control.
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