🚨 Anthropic opens public access to Claude Fable 5, a guarded version of its Mythos frontier model 🚨
Anthropic has released Claude Fable 5 to the public for the first time, giving API and paid enterprise users access to a version of its Mythos model. The launch comes with tight safety limits, usage restrictions, and a new retention policy for traffic tied to the model.
🔑 Key highlights:
🔹️ Claude Fable 5 is the first publicly available version of Anthropic’s Mythos model.
🔹️ The model is designed for software engineering, knowledge work, and vision tasks.
🔹️ In high-risk areas like cybersecurity, biology, chemistry, and distillation, it blocks responses and falls back to Claude Opus 4.8.
🔹️ Anthropic says Fable 5 and Mythos 5 were stress-tested against jailbreak attempts before release.
🔹️ The company will require a 30-day retention period for all traffic using the new models, even for enterprises that previously had zero-retention agreements.
🔹️ Pricing is set at $10 per million input tokens and $50 per million output tokens.
🔹️ Anthropic says at least 95% of Fable sessions run entirely on the model itself without needing fallback.
🎯 Bottom Line: Anthropic is opening access to a powerful new model, but it is doing so with stricter safety and data-retention controls.
https://techcrunch.com/2026/06/09/anthropics-claude-fable-5-is-a-version-of-mythos-the-public-can-access-today/