The AI giants just broke with OpenAI and Anthropic on open weights

Twenty-five major AI companies and organizations published an open letter advocating for open-weight AI models and urging US policymakers not to restrict them, contrasting with closed-model leaders like OpenAI and Anthropic who did not sign. The letter argues that open models enhance AI safety and innovation, challenging the closed labs' safety rationale, amid tensions over Chinese open models and concerns about technology transfer.