Anthropic Launches Claude Fable 5.1 and Mythos 5.1 With 45% Lower Agent Costs
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- 05 Sep, 2026
On September 2, Anthropic introduced Claude Fable 5.1 and Claude Mythos 5.1, its latest generation of models for coding, knowledge work, cybersecurity, and scientific research, per the official Anthropic announcement.
Two models for different workloads
Claude Fable 5.1 and Claude Mythos 5.1 target long-running engineering tasks, knowledge work, and scientific research, with Anthropic highlighting a "new performance frontier" for the models.
Agent costs down 45%
According to TechStartups, Anthropic reduced cache-read pricing, translating to roughly 45% lower AI agent costs — a meaningful shift for companies running autonomous agents at scale.
Tighter safeguards
Anthropic also says it tightened safeguards, reducing unnecessary blocks on legitimate cybersecurity and scientific research requests.