Replit Raises $250M Series C and Launches Agent 3, an Autonomous Software Developer

September 10, 2025

Details

  • Replit has secured a $250 million Series C funding round, announced on September 10, 2025, as confirmed by Y Combinator.
  • The company introduced Agent 3, which it describes as the first fully autonomous "self-driving" software engineer.
  • Agent 3 operates independently for over 200 minutes, continuously building, testing, and fixing applications without human intervention.
  • The agent integrates directly with Replit’s cloud IDE, managing compilers, test suites, and deployment workflows in an automated loop.
  • Funds from the new round will support expanded GPU infrastructure, safety research for agents, and enterprise partnerships for broader adoption.
  • This move follows Replit’s previous $80 million Series B in 2023, totaling about $430 million in disclosed investment.

Impact

This milestone pressures competitors like GitHub Copilot, Cognition’s Devin, and Hugging Face’s StarCoder to match Replit's advancements in agent autonomy. By automating the full software development cycle, Agent 3 could reduce costs and quicken release schedules. The funding also reflects strong investor confidence in AI-driven development tools and sets the stage for a more competitive and regulated environment.

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