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Decagon

AI agents for customer support

Ranked #5 in Best AI Agent Startups.

Decagon, founded in 2023 in San Francisco, builds AI agents that resolve customer support requests over chat, email and voice. It raised a $250 million Series D at a $4.5 billion valuation in January 2026, led by Coatue and Index Ventures.

Official website

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At a glance

Price fromCustom
Best forConsumer brands with high support volumes

From Decagon's own website.

What stands out

  • Large enterprise customer base
  • Works across chat, email and voice

Worth knowing

  • Enterprise focus
  • Price not published

How it ranks

Decagon is ranked 5th of 10 in Best AI Agent Startups (Lister Score 92.2).

#5 in Best AI Agent Startups · Lister Score 92.2

Decagon's enterprise customers include Avis Budget Group, Block and Deutsche Telekom..

RankBest AI Agent StartupsScore
1Sierra97.0
2Cognition95.9
3Harvey94.7
4Replit93.5
5Decagon92.2
6Glean91.0
7Parloa89.7
8Genspark88.4
9Lindy87.1
10CrewAI85.8

Frequently asked questions

How does Decagon rank on Lister?

Decagon is ranked 5th of 10 in Best AI Agent Startups (Lister Score 92.2).

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#5 in Best AI Agent Startups
RANKED #5 ON LISTERBest AI Agent Startups