LinkAnthropic PBCResource
The expanded lineup provides developers and organisations with insight into Anthropic's multi-tier model approach, emphasising agentic automation and specialized scientific tooling.
The platform structure demonstrates an increased focus on specialized professional workflows and agentic systems. By introducing tiers like Fable 5.1 and Mythos 5.1 alongside updates to Opus 5 and Sonnet 5, Anthropic separates broad knowledge tasks and coding into targeted offerings, complemented by dedicated vertical applications like Claude Science.
Summary generated by AI (Gemini 3.8 Flash, 27 September 2026). It may contain errors – the original source is authoritative.
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Link:Anthropic
Anthropic has announced Claude Fable 5.1 and Claude Mythos 5.1, its latest frontier models for software engineering, knowledge work, and scientific research. While sharing the same underlying model, they feature different safeguard tiers, reduced pricing, and improved agentic performance.
Article:Anthropic
Anthropic's release notes track Claude's product progression through mid-2026, highlighted by the rollout of Claude Fable 5.1, Mythos 5.1, Opus 5, and Sonnet 5, alongside expanded Cowork capabilities and enterprise governance controls.
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Anthropic has released Claude Fable 5 and Claude Mythos 5, two Mythos-class AI models. Fable 5 is tailored for general use with conservative safety fallbacks, whereas Mythos 5 provides unrestricted access to advanced cybersecurity capabilities for vetted defenders via Project Glasswing.
Link:Anthropic
Anthropic has released Claude Opus 5, its flagship model designed for advanced software engineering, autonomous AI agents, and complex enterprise workflows. It introduces effort controls for variable compute depth and is accessible via the API, Claude subscriptions, and major cloud hyperscalers.
Link:Anthropic
Anthropic has released Claude Fable 5.1, designed for demanding software engineering tasks and multi-day agentic workflows with automatic fallbacks for sensitive domains.
Article:Anthropic
Anthropic has launched Claude Sonnet 5, engineered for advanced agentic performance, tool use, and software development. The model closely approaches the performance of Opus 4.8 while operating at a permanent price of $2 per million input tokens and $10 per million output tokens.
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