Anthropic workforce expands from 940 to 5,300 in under two years

Anthropic, the AI company behind the Claude family of models, now employs approximately 5,300 people. At the end of 2024, that number was about 940.

The figures come from the company’s S-1 filing, dated October 26, 2026, ahead of an anticipated IPO in mid-November. It’s a more than fivefold jump in just under two years.

The numbers behind the hiring spree

The headcount figure is measured as of September 30, 2026. The starting point is December 31, 2024, when the company had roughly 940 people on payroll.

According to the research findings on the filing, Anthropic’s trailing twelve-month revenue per employee topped $6.6 million by September 30, 2026. A year earlier, that figure sat at $1.4 million.

Revenue rose by roughly 1,200% over the period, while headcount grew about 170%.

First-half 2026 revenue reached $16.29 billion. That marks a 1,304% increase compared with the same stretch a year earlier.

Claude is doing a lot of the coding

The filing indicates that more than 90% of contributions to the company’s codebase in September 2026 came from its Claude models.

That internal reliance appears to be reshaping who the company hires. The research points to a decline in junior technical hires, alongside heavy use of AI for operational work.

Still, Anthropic isn’t done recruiting. Hundreds of positions remain open at the company.

People are still expensive

Personnel expenses in the third quarter of 2026 exceeded $1.7 billion.

Of that total, $1.1 billion came from stock-based compensation.

Those personnel costs have been shrinking as a share of revenue over time, even as the absolute dollar figures remain hefty.