Anthropic Raises $4.5B to Scale AI Safety Research

Anthropic, the AI safety startup founded by former OpenAI researchers, has raised $4.5 billion in a Series D funding round. The investment will fund the development of more robust AI alignment techniques and the scaling of their Claude model family.

The company's unique approach to "constitutional AI" aims to build systems that are helpful, harmless, and honest by design. This methodology involves training models with explicit values and constraints that prevent harmful outputs while maintaining utility.

CEO Dario Amodei emphasized the critical importance of getting AI safety right as systems become more capable. The funding will support expanded research into interpretability, adversarial testing, and long-term AI alignment challenges.