Anthropic's more powerful AI models, Opus and Sonnet, are now being used across all platforms for voice conversations with Claude. This upgrade allows Claude to compose and send emails directly by voice, a feature currently unmatched by other AI assistants. The integration of these advanced models enhances Claude's capabilities, particularly in tasks that require more complex interactions. This development is significant because it highlights the ongoing advancements in AI technology and the competitive landscape of AI assistants.