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Table of Contents The Claude Model Family The Claude model family is currently composed of four model classes: Mythos (including Fable), Opus, Sonnet, and Haiku. Our model classes can be used individually for certain tasks or in combination with one another. They offer broad flexibility to choose the ideal performance, cost, and speed for each use case. All models support text, code, and multimodal inputs. • Mythos (including Fable). Our most capable model class, delivering frontier performance across all domains and solving problems AI has not reliably handled before, especially in coding and long- running agentic tasks. Given its advanced capabilities in sensitive areas like software vulnerability discovery and biology, we deploy this underlying model in two distinct configurations. Fable is generally available and runs with our production safeguards, which block or limit performance on certain sensitive topics, including by routing requests to a less capable Claude model. Mythos runs with safeguards calibrated for vetted organizations and individuals doing cybersecurity and life sciences work, and is available through our trusted-access programs, including our Cyber Verification Program. We first made the class available in April 2026 as Claude Mythos Preview through Project Glasswing, made Fable 5 generally available and offered Mythos 5 to Project Glasswing participants in June 2026, and released Mythos 5.1 and Fable 5.1 in September 2026. • • Opus. Our powerful workhorse model class for reasoning-intensive tasks. Our most recent Opus release, Claude Opus 5.5, is designed to serve as the enterprise daily driver, powering agents that run projects end to end and advancing capabilities across agentic coding, computer use, and knowledge work. Opus models consistently rank among leading models on key industry benchmarks. Sonnet. Our versatile model class for everyday tasks, providing a balance of performance, cost, and speed for the widest set of general-purpose use cases, including high-volume sub-agents in multi-agent orchestration setups. • Haiku. Our lowest-cost and fastest model class. Haiku models are designed for high-volume workloads like customer service agents and large-scale document processing. 199 [Embedded graphic 1 — OCR text] Value delivered to customers Platform More productive employees * Claude Chat Collaborate with Claude Code Build software with Claude Cowork Delegate tasks to Claude Faster processes Do-it-yourself Work with us with our developer by building custom building blocks agents together Embedded intelligence Create Claude-fueled experiences Tag Works alongside teams SPECIALIZED PRODUCTS EXAMPLES EXAMPLES F A Accelerate drug Knowyour Streamline Legal Financial Recruiting Sesuiley wisest © r | & a discovery customer contract review casework agent analysis agent agent Platform features Context management Infrastructure Harnesses Extended thinking Adaptive thinking —_ Effort controls Model Context Protocol Prompt caching Agent SDK Tooluse Longcontext Structured outputs Model Hardware Standard Batch processing Claude Managed Agents Code execution Websearch Files API Agent skills Fast mode “%€ClaudeMythos Claude Opus “%ClaudeSonnet Claude Haiku Frontier intelligence Powerful intelligence General-purpose intelligence Cost-effective intelligence
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