Because at the moment they have basically infinite money and it's almost always faster to throw hardware at the problem than optimizing the solution, given infinite money.
[1] https://www.morningstar.com/stocks/anthropics-leaked-financi...
[2] https://www.wheresyoured.at/anthropics-profitability-swindle...
[3] https://fortune.com/2026/06/16/openai-financials-leaked-loss...
[4] https://www.forbes.com/sites/paulocarvao/2025/12/06/why-open...