Anthropic has introduced the next generation of its artificial intelligence (AI) models, Claude Opus 4 and Claude Sonnet 4. “These models advance our customers’ AI strategies across the board: Opus 4 pushes boundaries in coding, research, writing and scientific discovery, while Sonnet 4 brings frontier performance to everyday use cases as an instant upgrade from Sonnet 3.7,” the company said. The company said Claude Opus 4 is its most powerful model yet and “the world’s best coding model,” adding that it delivers sustained performance on complex, long-running tasks and agent workflows. Claude Sonnet 4 balances performance and efficiency . It provides a significant upgrade to its predecessor, Claude Sonnet 3.7, and offers superior coding and reasoning while responding more precisely to user instructions. Both models can use web search and other tools during extended thinking, use tools in parallel, and extract and save key facts from local files, per the announcement. In addition, both models offer two modes, including near-instant responses and extended thinking. These models are a large step toward the virtual collaborator — maintaining full context, sustaining focus on longer projects, and driving transformational impact.