Anthropic was founded in 2021 by Dario Amodei, Daniela Amodei, and several colleagues who departed OpenAI amid disagreements over commercial direction and safety. The company pioneered constitutional AI training methods and made model behavior control central to its public identity. Amazon invested up to $4 billion, making AWS the primary cloud partner. Google also committed multi-billion funding. Anthropic's ban from certain government contexts — and subsequent reinstatement discussions — has become one of the more closely watched policy signals of 2025–2026. Its PBC structure creates different obligations than OpenAI's capped-profit model, a distinction that matters increasingly as both companies negotiate federal contracts.