Claude Fable 5 - Anthropic’s best publicly available model (jun 9, 2026 – 4h 6min, jul 26, 2026 y)
Description:
Anthropic releases Claude Fable 5, the first Mythos-class model made safe for general use, alongside Claude Mythos 5, a restricted variant for vetted cybersecurity defenders and infrastructure providers through Project Glasswing. Fable 5 excels at software engineering, knowledge work, and vision, but ships with built-in safety classifiers that automatically fall back to Claude Opus 4.8 for high-risk queries in areas like cybersecurity, biology, chemistry, and distillation. The model offers a 1 million token context window and up to 128K output tokens, priced at $10 per million input tokens and $50 per million output tokens, double the cost of Claude Opus 4.8.Added to timeline:
Date:
jun 9, 2026
4h 6min, jul 26, 2026 y
~ 1 months and 17 days