Decagon

Decagon is one of the breakout companies of the agentic conversational AI wave, building AI agents that resolve customer support end to end. Founded in 2023 by Jesse Zhang and Ashwin Sreenivas — who previously built and sold startups and worked at Google, Citadel Securities, and Palantir — and headquartered in San Francisco, Decagon delivers "concierge" customer experience: its agents answer questions, take actions across business systems, and escalate gracefully, with a design layer that lets support teams shape agent behaviour without code.

Its customers span large enterprises across airlines, banking, telecom, and retail as well as high-growth companies including Notion, Duolingo, Rippling, Eventbrite, Substack, Affirm, and Chime. Decagon has raised roughly $481 million; a $131 million Series C in mid-2025 set a $1.5 billion valuation, and a $250 million Series D led by Coatue and Index Ventures in January 2026 tripled that to $4.5 billion.

Choose Decagon when you want a fast-moving, LLM-native support agent with strong tooling for operations teams.