Anthropic launches Claude Fable 5.1 and says it’s up to 45 percent cheaper for agentic work
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TL;DR
- Anthropic launched new AI models: Fable 5.1 and Mythos 5.1.
- Fable 5.1 is reportedly up to 45 percent cheaper for agentic tasks and offers improved performance.
- Early users like Every and Box report Fable 5.1 is a stronger coding model and better at understanding data subtleties.
- Mythos 5.1 shows comparable low reasoning scores to its predecessor's max reasoning.
- Fable 5.1 has more precise safeguards, less likely to block basic biology questions, unlike Mythos 5.1.
- Enterprise Frontier Safeguards will offer data privacy by storing data on customer servers.
- Fable 5.1 can now be used for identifying software vulnerabilities, but some advanced cybersecurity tasks remain with Opus models.
- Fable 5.1 is available on all platforms; Mythos 5.1 is exclusive to Project Glasswing participants.