It's not Anthropic's strategy, it's OpenAI's strategy. The first time OpenAI said its model was "too dangerous to release" was February 2019.

"Our model, called GPT‑2 (a successor to GPT ), was trained simply to predict the next word in 40GB of Internet text. Due to our concerns about malicious applications of the technology, we are not releasing the trained model." - https://openai.com/index/better-language-models/

They continue to say the same thing every year. Last time was 2 months ago (https://www.techbrew.com/stories/2026/04/15/calculated-risks...).