Anthropic Pushes Claude Sonnet 4.5 for Enterprise Coding and Autonomous Systems

Anthropic launched Claude Sonnet 4.5 on September 29, 2025, explicitly targeting enterprise API customers building coding copilots and autonomous agents. The move signals a direct competitive play against OpenAI and Google DeepMind for high-volume production workloads. Sonnet has been positioned as the volume tier since mid-2024, with free consumer access seeding developer adoption before enterprise scaling.