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# Replit Unveils Most Advanced Autonomous AI Agent Yet, Raises $250 Mn at $3 Bn Valuation to Power Next-Gen AI Apps
- URL: https://www.theleftshift.com/replit-unviels-most-advanced-autonomous-agent-yet-raises-250m-at-3b-valuation-to-power-next-gen-ai-apps/
- Published: 2025-09-11T06:06:04.000Z
- Updated: 2025-09-11T06:11:06.000Z
- Description: Agent 3 introduces the ability to create agents and workflow automations for platforms like Slack, Telegram, Notion, and Dropbox.
- Author: The Left Shift Bureau
- Tags: AI Agents, Funding

Replit has[ unveiled](https://blog.replit.com/introducing-agent-3-our-most-autonomous-agent-yet?ref=theleftshift.com) **Agent 3**, its most advanced and autonomous AI agent yet, marking a major leap from Agent V2\. The new version is **10x more autonomous**, capable of testing apps in the browser and automatically fixing issues through a proprietary testing system that is **3x faster and 10x more cost-effective** than existing computer-use models. 

*"Our proprietary testing system is 3x faster and 10x more cost-effective than state-of-the-art Computer Use Models," Amjad Masad, CEO at Replit, said.*

The startup also [raised $250 million in a series C round ](https://replit.com/news/funding-announcement?ref=theleftshift.com)at a $3 billion valuation. The round was led by Prysm Capital with backing from Google’s AI Futures Fund, Amex Ventures, a16z, and others. Funds will fuel scaling, product development, and global expansion.

> AI agents can prototype apps… But shipping real software takes hours of testing, debugging, and refactoring.  
>  
> Agent 3 is 10× more autonomous — it keeps going where others get stuck.  
>  
> The “Full Self-Driving” moment of software. [pic.twitter.com/z66nxQKieO](https://t.co/z66nxQKieO?ref=theleftshift.com)
> 
> — Amjad Masad (@amasad) [September 10, 2025](https://twitter.com/amasad/status/1965800350071590966?ref%5Fsrc=twsrc%5Etfw&ref=theleftshift.com)

Uniquely, Agent 3 can also [build other agents ](https://www.theleftshift.com/replits-smarter-ai-agent-can-now-think-deeper-search-the-web-and-build-better-apps/)and automations, streamlining complex workflows with natural language commands. "That means you can automate complex and repetitive workflows using natural language. Just select the “Agents & Automations” option from the homepage to get started," the company said in a blog post. 

Among the standout features is **App Testing**, which runs by default and allows Agent 3 to [actively test applications](https://www.theleftshift.com/replit-ai-bot-wipes-out-entire-database-sparks-alarm-over-agent-autonomy/) in a live browser. Users can watch the agent’s cursor interact with buttons, forms, APIs, and login flows, ensuring every component functions as intended. For bigger projects, a **Max Autonomy (Beta)** mode lets Agent run independently for up to **200 minutes**, managing task lists, supervising its own progress, and fixing errors with minimal input.

In a first, Agent 3 also introduces the ability to create **agents and workflow automations** for platforms like Slack, Telegram, Notion, and Dropbox. Users can deploy bots for tasks such as answering GitHub queries, generating daily task summaries, or even preparing automated meeting briefs. A streamlined integration flow eliminates the need for manual API key management, making automation setup faster and more secure.

Replit has also added a **new app creation flow**, allowing users to choose between full-stack builds or lightweight front-end prototyping before scaling up. With these updates, Replit is positioning Agent 3 as a tool that not only accelerates app development but also reshapes how developers approach automation and productivity.