Anthropic Claude Fable 5.2 Launches on B.AI, Further Enhancing Long-Context and Agent Capabilities

On November 10, the B.AI platform announced the official launch of Anthropic Claude Fable 5.2, simultaneously opening both the API and Web Chat endpoints. Designed for complex reasoning, software engineering, and long-cycle Agent workflows, the model features always-on adaptive thinking, equipped with a massive 1M token context window and up to 128K output tokens. According to the Artificial Analysis Intelligence Index v5, Claude Fable 5.2 topped the rankings with a score of 65 at its highest configuration, far exceeding the 40-point median of comparable models. The model also strikes a balance between performance and cost: generation speeds are boosted by up to 30% compared to Fable 5.1, with standard pricing set at $8.00 per million input tokens and $40.00 per million output tokens, and supports prompt caching to accommodate high-intensity reasoning and high-frequency invocation demands. Visit chat.b.ai/chat to experience it now.