claude-fable-5-1 · claude_max

Claude Fable 5.1 is Anthropic's latest model, built for rigorous reasoning and long‑horizon agent tasks, with enhanced performance in extended coding, multi‑step research, and workflows involving documents, spreadsheets, and slides. It supports text and image inputs, text outputs, a 1‑million‑token context window, and always‑on workload‑guided adaptive thinking capabilities.