Claude Fable 5.1 officially launches on B.AI API, specifically designed for complex reasoning and Agent workflows

B.AI platform announces that Anthropic's latest Mythos-level general model Claude Fable 5.1 is now officially integrated with the API.

This model uses the same underlying model as Claude Mythos 5.1, specifically optimized for high-intensity coding, long-term agent workflows, and complex knowledge tasks. It achieved an excellent performance of 73.4% at maximum computational intensity in the CursorBench 3.2.0 test.

API access is now open, and developers can enjoy exclusive discounts—official channels as low as 15% off, and self-selected service providers as low as 40% off. B.AI continues to introduce top global models, providing developers with more powerful and cost-effective AI capability options.