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AI coding tools slow developers despite perceived speed boost

July 12, 2025•Thomas Claburn•Original Link•2 minutes
AI
Software Development
Productivity

Study finds AI coding tools increase task completion time by 19% despite developers believing they were 20% faster

A recent study by Model Evaluation & Threat Research (METR) reveals that AI coding tools actually slow down software developers, contrary to widespread expectations of increased efficiency. The research, published in their report, found that while developers predicted a 24% speedup, the tools increased task completion time by 19%.

Key Findings

  • Developers overestimated AI's benefits: Even after the study, participants believed AI had made them 20% faster, despite the opposite being true.
  • Hallucinations and cleanup: Developers spent significant time reviewing and correcting AI-generated code, accepting less than 44% of suggestions.
  • Context matters: AI performed poorly in large, complex repositories (1M+ lines of code) and struggled with implicit repository context.

Methodology

The study involved 16 experienced developers working on 246 real-world issues (bug fixes, new features) in open-source projects. Tasks were randomly assigned with or without AI tools (primarily Cursor Pro with Claude 3.5/3.7 Sonnet). Work was conducted between February and June 2025.

Why AI Slowed Developers Down

  1. Over-optimism: Unrealistic expectations about AI's capabilities.
  2. High developer familiarity: Experienced coders gained little from AI assistance.
  3. Large repositories: AI struggled with scale and complexity.
  4. Low reliability: Time spent fixing AI errors offset potential gains.
  5. Context gaps: AI lacked understanding of project-specific nuances.

Broader Implications

This aligns with other research, including:

  • A Qodo study showing AI-generated code requires extra validation.
  • An Intel report finding AI PCs reduce productivity.
  • Call center workers noting AI creates more work despite accelerating some tasks.

Caveats

The authors—Joel Becker, Nate Rush, Beth Barnes, and David Rein—caution that results are context-specific. AI may still aid productivity in smaller projects or for less-experienced developers. They emphasize this is a snapshot of current tools and future models may improve.

The Bottom Line

While AI coding tools can automate routine tasks and explore new scenarios, they currently do not save time overall due to the overhead of validation and correction. For now, they may make coding more fun—but not more efficient.

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August 27, 2025•www.ETCIO.com

Salesforce Exec Discusses AI Governance and Enterprise Adoption

Sabastian Niles, President and Chief Legal Officer at Salesforce, shares insights on AI governance, transparency, and global regulations for businesses.

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Salesforce
August 27, 2025•ForkLog

Anthropic Launches Claude AI Agent for Chrome

Anthropic introduces a Chrome extension for its Claude AI agent, initially available to 1,000 Max plan subscribers, with browser-integrated autonomous capabilities.

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About the Author

Dr. Sarah Chen

Dr. Sarah Chen

AI Research Expert

A seasoned AI expert with 15 years of research experience, formerly worked at Stanford AI Lab for 8 years, specializing in machine learning and natural language processing. Currently serves as technical advisor for multiple AI companies and regularly contributes AI technology analysis articles to authoritative media like MIT Technology Review.

Expertise

Machine Learning
Natural Language Processing
Deep Learning
AI Ethics
Experience
15 years
Publications
120+
Credentials
3
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