On February 18, 2026, U.S. AI company Anthropic released its mid-sized AI model, Sonnet 4.6, featuring notable improvements in code writing, instruction following, and computer operations. The model supports a context window of up to 1 million tokens, double the size of the previously available maximum context, enabling it to handle more complex engineering projects and legal texts. Sonnet 4.6 will immediately become the default model for both free and paid Pro users, maintaining Anthropic's iterative pace of one release every four months.
