Anthropic Claude Fable 5

**Anthropic** released two major models: **Claude Fable 5** for general availability and **Claude Mythos 5** for restricted access, with fallback to **Claude Opus 4.8** for sensitive queries. **Fable 5** features a **1M-token context window** and pricing at **$10/million input tokens** and **$50/million output tokens**. It leads benchmarks in software engineering, knowledge work, scientific research, and vision, outperforming **GPT-5.5** and setting new state-of-the-art scores on **CursorBench**, **FrontierCode**, **Terminal-Bench 2.1**, and **Artificial Analysis Intelligence Index**. The rollout includes Pro, Max, Team, and Enterprise plans with temporary usage credits due to capacity constraints. Middleware SDK support is available in **Python, TypeScript, Go, Java, and C#**.