GoKawiilAnthropic releases Claude Fable 5.1 and Mythos 5.1 with lower pricing
Anthropic has launched Fable 5.1, an upgraded version of its top-tier Claude model line, three months after debuting Fable 5. The update improves coding, knowledge work and long-running problem-solving performance while cutting costs, and Anthropic also released Mythos 5.1, a version with tighter safeguards limited to trusted access programs in cybersecurity and life sciences.
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By pairing performance gains with meaningfully lower token costs—up to 45% cheaper for agentic workloads—Anthropic is pushing to make advanced AI more economical for enterprise use, intensifying competition with rivals like OpenAI and Google. The dual-release strategy of a public model and a restricted, safeguarded variant also signals how AI labs are trying to balance capability with controlled access for sensitive domains.
- Fable 5.1 upgrades Anthropic's top Claude tier for coding and complex problem-solving.
- Pricing drops roughly 25% generally and up to 45% for agentic workloads due to cheaper cache reads.
- Mythos 5.1 offers the same model with added safeguards, restricted to trusted cybersecurity and life sciences users.
Source: 9to5mac.com — Zac Hall, 2026-09-01
Published there as: “Anthropic upgrades Claude with new Fable 5.1 model, details here”
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