Adept vs Sierra AI

By valuation, Sierra AI is the larger company at $10B versus $1B — a 10x difference. Size can also be measured by team: Adept employs 200 people while Sierra AI has 150 employees.

Sierra AI has raised more in total funding at $635M, compared to Adept's $415M — a gap of $220M. Combined, the two companies have completed 6 known funding rounds.

Sierra AI leads with an Awaira Score of 92/100, while Adept sits at 76/100. That 16-point gap reflects real differences in funding, scale, and traction — it's not a vanity metric.

Adept was founded by David Luan in 2022. Sierra AI was founded by Bret Taylor in 2023. Visit each company's profile on Awaira for a full founder biography.

Adept: Adept is an AI company founded in 2022 that develops AI agents capable of performing complex tasks across digital environments. The company specializes in creating AI systems that can interact with software applications, browsers, and APIs to automate workflows and assist with knowledge work. Adept's core technology focuses on large language models combined with reinforcement learning to enable agents that learn from user interactions and improve over time. The company raised $415 million in total funding and achieved a $1 billion valuation, securing investment from prominent venture capital firms including Khosla Ventures and others. Adept's approach targets enterprise automation, aiming to create agents that can handle tasks like data entry, research, customer support, and business process automation. The company positioned itself in the competitive AI agents landscape alongside other startups and established tech companies building autonomous systems. Adept was subsequently acquired, marking a significant exit in the AI sector. The acquisition reflected growing enterprise demand for AI automation tools and validated the market opportunity for agent-based systems. The company's focus on practical automation applications rather than consumer-facing AI differentiated its positioning. Adept's trajectory from founding through acquisition occurred during rapid expansion in generative AI investment and adoption across industries. Adept pioneered enterprise-focused AI agents designed to autonomously execute complex digital workflows through direct software interaction. Sierra AI: Sierra AI builds conversational AI agents designed to serve as the primary customer experience layer for consumer brands, replacing traditional chatbots and interactive voice response systems with autonomous agents capable of handling complex, multi-turn interactions. Co-founded in 2023 by Bret Taylor, former co-CEO of Salesforce and chairman of the board at OpenAI, alongside Clay Bavor, a former Google executive who led AR/VR initiatives, the company brings unusual executive credibility to the enterprise AI agent space. The company has raised approximately $635 million in total funding, achieving a $10 billion valuation at its Series C round. Investors include Sequoia Capital, Benchmark, and Greenoaks Capital. Sierra's agents integrate directly into existing enterprise tech stacks, handling tasks from order management and subscription changes to returns processing and account troubleshooting — all without requiring human escalation for the majority of interactions. Clients reportedly include WeightWatchers, Sonos, and other major consumer brands. Sierra AI operates in a rapidly consolidating AI customer service market, competing against Intercom's Fin, Ada, and legacy players like Zendesk and Salesforce Service Cloud. The company's advantage stems from its founding team's deep enterprise relationships and product instincts refined across decades at Google and Salesforce. With customer service representing an estimated $350 billion annual spend globally, Sierra's bet is that AI agents will absorb a significant share of that budget within five years, fundamentally restructuring how brands interact with their customers at scale.

Adept got there first, launching in 2022 — that's 1 year of extra runway. Sierra AI didn't arrive until 2023. In AI, that kind of head start means more training data, deeper customer relationships, and a bigger talent moat.

Adept has about 200 employees; Sierra AI has about 150. A bigger team usually means more revenue or heavier VC backing, but in AI, small teams can build at massive scale.

Yes — they're direct rivals. Both Adept and Sierra AI compete in AI Agents, targeting many of the same buyers. If you're evaluating one, you should be looking at the other.