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

Odaily News — On September 29, B.AI announced that Anthropic's latest Sonnet model, Claude Sonnet 5.5, has officially launched on the platform. As a faster, lower-cost complement to Claude Opus 5.5, Claude Sonnet 5.5 delivers over 30% improvement in output speed and reduces per-task costs by up to approximately 30%, targeting well-defined software engineering, everyday Agent workflows, and professional document creation scenarios. The model supports image and PDF understanding, can generate reports, presentations, spreadsheets, and UIs, and offers five adjustable reasoning effort levels along with a 1 million Token context window, with no additional charges for long context.

Currently, B.AI API and Web Chat are both available simultaneously, allowing developers and users to directly access this next-generation Sonnet model that balances speed, cost, and long-context capabilities.