Claude Sonnet 5.5 Officially Launches on B.AI, API and Web Chat Both Now Available

B.AI announces that Anthropic’s latest Sonnet model, Claude Sonnet 5.5, is now officially available on the platform. Serving as a faster, more cost-effective complement to Claude Opus 5.5, Claude Sonnet 5.5 boosts output speed by over 30% and reduces per-task costs by up to approximately 30%, making it tailored for well-defined software engineering tasks, daily Agent workflows, and professional document creation. The model supports image and PDF comprehension, enabling the generation of reports, presentations, spreadsheets, and UIs. It offers five adjustable reasoning intensity levels alongside a 1-million-token context window, with long-context processing included at no additional charge. Both the B.AI API and Web Chat platforms are now live, allowing developers and users to directly access this next-generation Sonnet model that seamlessly balances speed, cost-efficiency, and long-context capabilities. Visit B.AI to experience it.