ElevenLabs ARR hit $500M in 3+ years, An AI Infra Only Raised a Seed Sold for Nearly $1B
Cresta ARR hit $100M, Sierra is now at $15B valuation
Voice AI exploded： ElevenLabs, Cresta and Sierra
Voice AI is scaling faster than most people expected.
In the AI customer service space, Cresta has officially surpassed $100M in ARR, while legendary Sequoia investor Doug Leone has joined the Board as Chairman.
Cresta CEO Wu Ping said large enterprises are using the platform to fundamentally change how customer experience is delivered — moving away from fragmented systems toward a unified AI platform that combines human agents with AI agents.
Meanwhile, Sierra— founded by OpenAI Chairman Bret Taylor — announced a new $950M funding round led by Tiger Global and GV, valuing the company at $15B.
Just a few months ago, Sierra had already surpassed $150M ARR.
Today, the company serves 40% of the Fortune 50. Sierra believes the industry has reached an “intelligence inflection point,” where AI is moving beyond simple support tasks and starting to manage complex, end-to-end customer lifecycles.
At the infrastructure layer, Elevenlabs has now crossed $500M ARR, adding $150M ARR in just the first four months of this year alone.
The growth is being driven largely by enterprises deploying voice agents across customer support, sales, recruiting, and marketing operations.
ElevenLabs also announced the third extension of its Series D round. Alongside investors like BlackRock, Wellington, and more than 30 well-known actors, musicians, athletes, and entertainment executives participated for the first time.
ElevenLabs says that as AI reshapes how content is created and distributed, the ability to control and scale your voice into new languages and fan experiences could unlock entirely new revenue streams for creators.
In many ways, ElevenLabs is simultaneously building:
a B2B company,
a consumer product,
and foundational AI infrastructure.
An AI Infra Only Raised a Seed Sold for Nearly $1B
But one of the most interesting AI infrastructure companies has recently received almost no mainstream attention.
It raised less than $10M seed— and reportedly exited for around $1B.
It wasn’t building chatbots, AI agents, or video generation.
While the rest of the AI world obsessed over language models, focused on something far less glamorous but far more essential:
