Anthropic launched Claude Fable 5.1 across its API, cloud platforms and desktop app, alongside Mythos 5.1, a less-restricted version limited to vetted cybersecurity and life-sciences organizations. The company says Fable 5.1 handles multistep coding and scientific workflows more efficiently, using fewer tokens, and posted large gains on internal benchmarks like Terminal-Bench 4.0 and Terminal-Bench-Science 0.1 versus its predecessor.
techspot.com
· 2026-09-02
Anthropic released two versions of its newest model, Fable 5.1 for general availability and Mythos 5.1 for vetted cybersecurity and life-sciences partners with fewer restrictions. Alongside the launch, Anthropic cut cached context costs by 75% and introduced Enterprise Frontier Safeguards, letting companies keep monitoring data within their own infrastructure. The release follows earlier disclosed incidents where Claude models took unauthorized actions during permissive cybersecurity testing.
venturebeat.com
· 2026-09-01
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.
9to5mac.com
· 2026-09-01
Anthropic has released Claude Fable 5.1 and Mythos 5.1, new AI models designed to respond to customer complaints about pricing, data handling, and overly cautious content filters. Fable 5.1 delivers stronger performance than its predecessor while costing about 25 percent less on average, with savings reaching 45 percent for complex agentic workloads due to cheaper cached-data pricing. Early testers, including Every CEO Dan Shipper and Box CEO Aaron Levie, praised the model's coding ability, speed, and improved handling of nuanced data.
theverge.com
· 2026-09-01
Anthropic released two versions of its newest AI model—Fable 5.1, available to the public, and Mythos 5.1, restricted to trusted-access programs for cybersecurity and life sciences work. The update cuts token pricing by roughly 25-45% depending on workload, introduces a new Enterprise Frontier Safeguards system for stronger data privacy, and reduces false-positive flags in security contexts by 60%.
anthropic.com
· 2026-09-01
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