Within twelve months of March 2025, AI may be writing essentially all of the code.

The test is whether, by the end of March 2026, AI was writing 'essentially all of the code'. This means roughly 95% or more of newly written code across software development in general, not just within one company or team. TRUE: credible industry-wide measurements or surveys from around March 2026 show AI generating essentially all new code (about 95% or more). MOSTLY TRUE: the industry-wide share is very high (about 90–95%) and widely described as nearly all. MIXED: not used; this is a single-outcome prediction. MOSTLY FALSE: essentially all code is AI-written only within Anthropic or a few organisations or teams, which is a part stated as the whole. Also mostly false if AI writes a majority but clearly not essentially all of code industry-wide (about 50–90%), or if the threshold was reached only after March 2026. FALSE: the industry-wide AI-written share around March 2026 was below about half. The 'may' hedge does not change the test: the outcome either occurred or it did not.

Set before the research began.

1. E1 Claim Chowder: Anthropic CEO Dario Amodei on the Percentage of Code Being Generated by AI Today Daring Fireball (John Gruber) · 13 March 2026

   “It may well be true that 90 percent of the lines of programming code that are written today, Friday 13 March 2026, will have been generated by AI.”

2. E2 State of Code Developer Survey report - sonarsource.com Sonar · 15 August 2026

   “Developers also report that 42% of their code is currently AI-generated or assisted—a share that they predict will increase by over half by 2027, and up from only 6% in 2023.”

3. E3 How Much Code Do Developers Really Let Agents Write? - The JetBrains Blog JetBrains Research · 26 August 2026

   “~47% of their code is fully written by agents.”

4. E4 75% Google code now AI-generated, says Sundar Pichai: How company is putting AI to work The Indian Express · 26 April 2026

   “Today, 75 per cent of all new code at Google is now AI-generated and approved by engineers, up from 50 per cent last fall,”

The industry-wide surveys from 2026 put the AI-written share well below the 95% threshold. In Sonar's developer survey, developers said 42% of their code is currently AI-generated or AI-assisted, and they expected that share to keep rising toward 2027 (E2). JetBrains Research found about 47% of code fully written by agents (E3). Both figures are below half, though the 47% figure is close to the boundary the criteria set between false and mostly false. The roughly 90% figure in E1 is a commentator's opinion, not a measurement, and the 75% in E4 covers only Google, after the horizon. Neither shows essentially all code across the industry.