Twenty-five U.S. technology companies, including IBM, Meta Platforms, NVIDIA and Microsoft, signed a joint letter urging open model weights. The letter says open-weight models are critical to a healthy AI ecosystem and that the U.S. faces a choice on openness. It acknowledges real, unique risks from openness but argues that openness may be essential to AI safety, since closed models can be hacked, misused or fail in ways undetectable externally. Open weights, the letter says, allow broader resea

Twenty-five U.S. technology companies, including IBM, Meta Platforms, NVIDIA and Microsoft, signed a joint letter urging open model weights. The letter says open-weight models are critical to a healthy AI ecosystem and that the U.S. faces a choice on openness. It acknowledges real, unique risks from openness but argues that openness may be essential to AI safety, since closed models can be hacked, misused or fail in ways undetectable externally. Open weights, the letter says, allow broader researcher and developer scrutiny to identify vulnerabilities, build defenses and iteratively improve models.