Anthropic just introduced Claude Fable 5 and Claude Mythos 5 🚀

The interesting part:
Fable 5 and Mythos 5 are basically the same underlying model, but with different access and safety layers.

✅ Claude Fable 5 is the version available for general users. Anthropic says it is their most capable generally available model so far, especially for:

• Software Engineering
• Long-running agentic tasks
• Vision-based work
• Knowledge work
• Scientific reasoning
• Long-context workflows

One example they shared is pretty wild:
Stripe tested it on a 50M-line Ruby codebase, and it completed a migration in one day that would normally take a team more than two months. 🤯

But because the model is much stronger, Anthropic is adding stricter safeguards.

For risky areas like cybersecurity, biology/chemistry, and model distillation, some requests will automatically fall back to Claude Opus 4.8 instead of Fable 5. ⚠️

Claude Mythos 5 is the restricted version, mainly for trusted Cyber defenders, infrastructure providers, and later selected biology researchers. It has some safeguards lifted depending on the access program.

Pricing is 💸:
• $10 / 1M input tokens
• $50 / 1M output tokens


[ Read More ] : https://www.anthropic.com/news/claude-fable-5-mythos-5

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#AI #Claude #LLM
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