Sierra vs ElevenLabs: Why Tool Calling Beats Voice Models
Harry Stebbings and Cliff Weitzman break down voice AI: why Sierra owns enterprise GTM while ElevenLabs and Speechify battle at the API layer.
How to Build Your Own Data Center & Why Every Startup Should Do It
With Harry Stebbings, Cliff Weitzman · Sunday, September 6, 2026
Cliff Weitzman, founder and CEO of Speechify, joins Harry Stebbings to discuss the financial and operational reality of buying tens of millions of dollars in Nvidia GPUs instead of renting compute. They dive into Speechify's strategic expansion from consumer text-to-speech into enterprise B2B voice agents, how AI is transforming engineering workflows and compensation, and how GPU computing is revolutionizing personalized biotechnology.
Speechify's AI Engineering Playbook: Hiring for Slope over Syntax
Cliff Weitzman reveals why Speechify hires math talent over legacy coders, uses Claude Code, and measures production shipping over token leaderboards.
How Cliff Weitzman Uses GPU Clusters to Treat Rare Diseases
Cliff Weitzman explains how pocket sequencers, AlphaFold, and private GPU clusters enable founder-led research on rare orphan diseases.
Why Speechify Buys NVIDIA GPUs Instead of Renting Cloud Compute
Cliff Weitzman breaks down why renting NVIDIA H100 GPUs costs 1.5x their purchase price annually and how Speechify allocates compute across 3 tiers.
Cliff Weitzman: The B2B Mistake That Let ElevenLabs Win
Speechify CEO Cliff Weitzman explains why skipping B2B APIs was his biggest mistake and how he plans to beat ElevenLabs on cost.