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July 13Monday
  1. Vapi Blog58

    Vapi Humanness Index: Grok TTS scores 95 and MiniMax Speech 2.5 scores 93 against a real human at 100

    Vapi's Humanness Index, a blind crowdsourced leaderboard where listeners pick which of two cloned voices sounds more human, places xAI's Grok TTS at 95 and MiniMax Speech 2.5 at 93 against a real human recording scored at 100 after more than 11,000 votes. Every battle uses the same cloned voice and script across models, and the real human recording is included in the comparison set, so a 95 means listeners chose Grok TTS at nearly the same rate as the human on the same quote. Vapi argues naturalness is no longer the bottleneck for voice agents, since callers experience the voice rather than the reasoning behind it.

April 24, 2025Thursday
  1. Modal Blog22

    How Lemon Slice built real-time generative video with Modal and Daily

    Lemon Slice built Lemon Slice Live, a product for real-time video conversations with AI characters, using Modal and Daily's low-latency primitives to reach an end-to-end video response latency of 3-6 seconds. The pipeline runs a Pipecat server and a 1B parameter video model on separate Modal containers that communicate via Modal's Tunnel and are co-located with region selection, with Deepgram, Grok and ElevenLabs handling speech-to-text, LLM response and text-to-speech. Earlier, two Python Modal Functions let Lemon Slice scale to 10,000 requests per hour without managing an ECS cluster, job queue or load balancer.