B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
19%
19% -- task completion time increase for experienced developers using AI tools (2025-07)
Experienced developers using AI tools took 19% longer to complete tasks.
- May not apply to all use cases
- Tools are improving rapidly
Attribution:
View source
Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
19%
Unit
Percentage
Data Vintage
2025-07
Entity
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
95
Source Trust
50
Citation Chain
20
Independence
30
Methodology
60
Freshness
86
Source
METR
Primary
Tier A
https://sumgenius.ai/blog/vibe-coding-cursor-bolt-lovable-explained-2025/ ↗
Source Article
Vibe Coding: How Cursor & Bolt Kill Programming
Vibe Coding Explained: How Cursor, Bolt, and Lovable Are Killing Traditional Programming
In February 2025, OpenAI co-founder Andrej Karpathy coined a term that would define the year: "vibe coding." By March, it was in the Merriam-Webster Dictionary. By November, Cursor (the AI coding IDE) raised $2.…
Original Research
METR
· Original study ↗
Methodology
Study published by METR
Methodology documented
Segmentation
Channelcommon_crawl
Cite this stat
Plain Text
experienced developers using AI tools: 19% task completion time increase. Source: METR (2025-07). Via Lighthouse Intelligence -- https://lighthousedata.io/data/metr-study-task-duration-2025
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<blockquote cite="https://lighthousedata.io/data/metr-study-task-duration-2025" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>19%</strong> -- task completion time increase for experienced developers using AI tools<br><small>Source: METR (2025-07) · <a href="https://lighthousedata.io/data/metr-study-task-duration-2025" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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