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While Wall Street panicked about AI spending, one of the fastest-growing AI products in the world was quietly taking off, and it is free. DeepSeek, the Chinese AI company that rattled Silicon Valley earlier this year, says its open-source AI agent app, Harness, reached 1.54 million daily active users as of November 4, 2026, less than three months after launch. For a free tool from a company best known for undercutting the giants on cost, that is explosive growth, and it says a lot about where AI is heading.
What Harness actually does
Harness is an open-source agent runtime, which is a technical way of saying it is software that lets you run AI agents that actually do things rather than just chat. Instead of only answering questions, an agent built on Harness can carry out multi-step tasks, connect to tools, and complete work on your behalf. Because it is open source, anyone can use it, inspect it, and build on top of it for free. That openness is the whole point: rather than locking users into one company's product, DeepSeek is handing out the engine and letting a community make it more capable.
How it grew to 1.54 million daily users so fast
The growth curve is the real headline. DeepSeek disclosed the numbers on the social platform X, and they show how quickly a free, open tool can spread. Daily users sat around 271,000 at the end of September and jumped to 1.54 million by early November, a roughly fivefold increase in about five weeks. Reports put daily usage at a staggering 92 trillion tokens, a rough measure of how much work the agents are doing. Part of the appeal is price. DeepSeek built its reputation on delivering strong AI at a fraction of the cost of US rivals, and free, capable agents are a powerful way to win users fast.
The plugin marketplace and what comes next
The next phase is a true ecosystem. Around 35,000 community-built plugins already extend what Harness can do, and roughly 60 percent of active users have created or installed at least one. DeepSeek now plans an official plugin marketplace, along with a program to support the developers who build those plugins, and it has already started distributing tokens to them. If that sounds familiar, it should: it is the app-store playbook applied to AI agents. A marketplace turns a single tool into a platform, and platforms are where the real staying power in software lives.
What it means for you
You do not have to be a developer to care about this. The rise of Harness shows that useful AI agents are becoming free, open, and widely available, which puts pressure on the paid tools to prove their worth. For anyone trying to get real work done with AI, more free, capable options is good news. It is worth a caveat: the user numbers come mostly from DeepSeek's own disclosures rather than independent audits, so treat the exact figures with healthy skepticism. The trend, though, is hard to argue with. The AI agent race is wide open, and some of the fastest growth is coming from tools that cost nothing to try.
