Anthropic's internal use of its Claude AI grew so fast this year that, by April 2026, the value of that usage at customer list prices exceeded the company's monthly personnel expenses, excluding stock-based compensation.
The figures, disclosed in the artificial intelligence company's amended stock market filing on 2 November, also show that Claude wrote more than 90 per cent of contributions to Anthropic's codebase in September.
Taken together, the numbers offer a snapshot of how deeply AI has been woven into the day-to-day work of the company that builds it. Anthropic said the list-price value of its internal Claude usage increased more than 250-fold between January and September.
However, this does not mean the company was paying more in actual cash for AI than it was spending on employees. The calculation uses the prices Anthropic charges customers to value its own internal consumption.
Claude Now Dominates Anthropic's Codebase
The coding figures are perhaps the clearest indication of how much the company now relies on its own technology. Anthropic reported that Claude produced more than 90 per cent of contributions to its codebase in September.
That does not mean 90% of its software engineers' jobs have been automated. Nor does it suggest that human developers have disappeared from the process.
Anthropic's filing describes engineers increasingly directing and reviewing AI-generated work, rather than simply writing every line themselves.
The company also reported that the average daily volume of code contributed per engineer was more than 45 times the 2024 average. That points to a change in how its engineering teams work, with developers able to oversee and contribute to much larger volumes of code with Claude's assistance.
Anthropic's revenue for the three months ended September 2026 was 86 times higher than its revenue for the three months ended December 2024. Its headcount also expanded considerably, rising from approximately 940 employees at the end of 2024 to around 5,300 by 30 September 2026.
Revenue, in other words, grew much faster than the workforce.
The comparison does not prove that AI caused the increase or that Claude has replaced employees. It does, however, show how the company has scaled its business without expanding its headcount at anything close to the same rate.
Anthropic's AI Valuation Is Not Its Actual Computing Bill
Anthropic measured its internal Claude usage using the list prices customers would pay for equivalent services. It then compared that notional value with monthly personnel expenses, excluding stock-based compensation.
Those are two different financial measures. The filing does not establish that Anthropic's actual cost of running Claude internally exceeded its payroll, nor does it disclose a separate cash figure for providing the company's employees with AI access.
The 250-fold increase refers to the value of internal usage at list prices, not a 250-fold rise in the company's AI bill. Anthropic is effectively showing how much of its own product its workforce is consuming at commercial rates.
The figures also arrive as the company continues to spend heavily on its workforce.
Anthropic reported $1.711 billion (£1.27 billion) in personnel expenses for the three months ended September 2026, down from $1.857 billion (£1.38 billion) in the previous quarter but around 3.5 times the $489 million (£363 million) recorded in the same period of 2025.
Its personnel expenses totalled approximately $4.86 billion (£3.61 billion) over the first nine months of 2026, representing about 14.6% of revenue during that period.
Billions on People, With Claude in a Central Role
The company's personnel expenses also need to be understood separately from individual salaries.
Around $1.1 billion (£817 million) of the September-quarter total came from stock-based compensation, accounting for roughly 64% of the $1.711 billion (£1.2 billion) figure. The remaining expenses included cash compensation, employee benefits and employer payroll taxes.
Anthropic had approximately 5,300 employees at the end of September.
Dividing its quarterly personnel expenses by that point-in-time headcount produces an average of about $107,600 (£79,900) per employee per month. That is a company-wide accounting calculation, not an estimate of what individual workers take home.
Anthropic does not disclose average employee salaries.
The filing also reported trailing 12-month revenue of more than $6.6 million (£4.9 million) per employee as of September 2026. That measure reflects the company's revenue relative to its workforce, rather than the earnings or productivity of any particular employee.
For Anthropic, the figures tell two stories at once. It is spending billions on people while increasingly relying on Claude to handle work that would traditionally involve substantial human input.
Its own filing suggests that the relationship between employees and AI is shifting from occasional assistance towards a much more central role in the company's everyday operations.
