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Replit Raises $250 Million at $3 Billion Valuation as AI Code-Gen Market Heats Up

Replit, the San Francisco-based AI software development platform, announced Wednesday it has raised $250 million in new funding, pushing its valuation to $3 billion. The round underscores booming investor interest in AI code-generation startups, which aim to help both developers and non-technical teams write software.

The financing was led by Prysm Capital, with participation from Google’s AI Futures Fund and Amex Ventures. Existing investors including Andreessen Horowitz (a16z) and Coatue also increased their commitments.

Replit’s growth has been dramatic: the company was valued at just over $1 billion in 2023 after raising $97.4 million. Its annualized revenue surged from $2.8 million to $150 million in under a year, reflecting accelerating adoption.

Competitive Landscape

The code-gen sector is attracting major capital. Rival Cognition raised $400 million at a $10.2 billion valuation earlier this week, while Cursor raised $900 million at a $10 billion valuation in May.

Replit CEO Amjad Masad said what sets Replit apart is its “vibe-coding” tools aimed at non-technical enterprise users, enabling departments from sales and HR to operations to accelerate product development.

Customers and New Tools

Companies such as Duolingo and Zillow already use Replit to build applications. On Wednesday, the company also launched Agent 3, an autonomous AI tool designed to test and fix code, as well as build custom agents and workflows.

Strategic Focus

Replit plans to invest the new capital in R&D, sales, and marketing, as it competes with well-funded rivals in the fast-evolving AI software development space.

Study Finds AI Tools Slow Down Experienced Software Developers in Familiar Codebases

A new study challenges the common assumption that artificial intelligence always speeds up software development. Conducted by AI research nonprofit METR, the study focused on seasoned developers working with Cursor, a popular AI coding assistant, within open-source projects they knew well. Contrary to their expectations, these experienced developers took 19% longer to complete tasks when using AI compared to working without it.

Before the study, developers predicted AI would speed up their work by about 20-24%, but the actual results showed the opposite. The study’s lead authors, Joel Becker and Nate Rush, expressed surprise at the findings, with Rush originally anticipating a potential twofold productivity increase.

These findings complicate the popular narrative that AI tools dramatically boost the productivity of highly skilled engineers—a claim that has helped fuel heavy investment in AI-powered software development products. While AI is often touted as a way to replace entry-level coding jobs, the METR study reveals that its benefits may not extend to all developers or coding scenarios.

Previous research has shown significant AI-driven productivity gains, with some studies citing up to 56% faster coding speeds or 26% more tasks completed in a given time. However, METR’s work highlights that these improvements might be more relevant to junior developers or those unfamiliar with complex codebases. Experienced developers, intimately aware of the nuances of mature open-source projects, tended to slow down because they spent extra time reviewing and fixing AI suggestions.

Becker noted that while AI-generated code was often on the right track, it frequently required careful correction to meet precise needs. The study authors emphasized that the slowdown was specific to the context of experienced developers working in familiar environments and might not occur in other development settings.

Despite the slower task completion times, most participants, including the study authors, continue to use Cursor, finding that AI makes coding less effortful and more enjoyable—comparable to editing an essay rather than starting from scratch. Becker explained, “Developers have goals other than completing the task as soon as possible. So they’re going with this less effortful route.”