All Models

Claude Sonnet 5.5 is Anthropic’s second model in the Claude 5.5 family, designed as a faster, more cost-efficient upgrade to Sonnet 5. It delivers 30%+ faster output with up to 30% lower cost per task, while supporting coding, AI agents, knowledge work, visual understanding, and everyday AI tasks.

Claude Opus 5.5 is Anthropic's first model in the Claude 5.5 family, delivering frontier-level performance in agentic coding, computer use, and knowledge work. With faster output, clearer communication, and significantly improved computational efficiency, it brings advanced intelligence to demanding, multi-step tasks.

Claude Fable 5.1 is Anthropic's flagship AI model built for complex, multi-step coding, advanced reasoning, scientific research, and knowledge-intensive work. It delivers stronger performance and greater cost efficiency than Fable 5, with particular improvements in long-running agentic workflows and demanding problem-solving tasks.

Claude Opus 5 is Anthropic’s thoughtful and proactive model, bringing near-Fable 5 intelligence to end-to-end coding, complex reasoning, visual analysis, and long-horizon enterprise work.

The Claude Sonnet 5 API is an agentic, multimodal interface delivering near-Opus performance with native computer use and self-verification capabilities. It features granular "Effort Levels," allowing engineering teams to precisely balance API deployment costs against task reasoning complexity.

Claude Fable 5 is Anthropic’s Mythos-class model for advanced general use, built for long-running coding, complex knowledge work, vision reasoning, and multi-step tasks that require stronger planning and verification.

Claude Opus 4.8 delivers a major upgrade in complex reasoning, agentic coding, and professional knowledge work. With improved honesty, stronger long-horizon task execution, and a 1-million-token context window on supported platforms, it is built as Anthropic’s most capable generally available model for high-autonomy workflows and demanding enterprise use cases.

Claude Opus 4.7 delivers stronger agentic coding, sharper visual understanding, precise instruction following, and sustained reasoning for complex professional tasks requiring reliability, context awareness, careful multi-step execution, and polished outputs.

Claude Sonnet 4.6 delivers strong reasoning, advanced coding capabilities, and native computer-use functionality. With adaptive thinking and a context window of up to 1 million tokens, it supports building reliable AI agents and large-scale automation workflows.

Claude Opus 4.6 is Anthropic’s upgraded Opus-class model for coding, long-context reasoning, agentic workflows, and complex knowledge work, with stronger debugging, better code review, and more reliable large-context performance.

Claude Haiku 4.5 is Anthropic’s lightweight AI model designed for fast, cost-efficient AI applications. It delivers near-frontier performance for coding, chat, and automation tasks while providing significantly faster responses and lower cost than larger Claude models.

Developed by Anthropic, Claude Sonnet 4.5 is a premier large language model that excels in multi-step reasoning, complex coding, computer use, and specialized domains such as finance.

Claude Opus 4.5 is Anthropic’s most intelligent model, combining maximum capability with practical performance across reasoning, coding, and complex problem solving.