AnthropicModels

Claude 3 Haiku is Anthropic's fastest and most compact model. It's designed for high-throughput, cost-effective applications where speed is a priority.

Claude Haiku 4.5 is Anthropic's fastest and most intelligent Haiku model. It has the near-frontier intelligence at blazing speeds with extended thinking and exceptional cost-efficiency.

Claude Opus 4 is Anthropic's previous flagship model. It has very high intelligence and capability.

Claude Opus 4.1 is Anthropic's exceptional model for specialized complex tasks. It has a very high level of intelligence and capability.

Claude Opus 4.5 is Anthropic's premium model with the best combination of speed and intelligence. It's intelligent, efficient, and the best model in the world for coding, agents, and computer use. It's also meaningfully better at everyday tasks like deep research and working with slides and spreadsheets.

Claude Opus 4.6 is a frontier model with strong capabilities in software engineering, agentic tasks, and long context reasoning, as well as in knowledge work—including financial analysis, document creation, and multi-step research workflows.

Claude Sonnet 4 is Anthropic's high-performance model with exceptional reasoning and efficiency.

Claude Sonnet 4.5 is Anthropic's best model for complex agents and coding. It has the highest level of intelligence across most tasks with exceptional agent and coding capabilities.

Claude Sonnet 4.6 suggests the best combination of speed and intelligence. It's a full upgrade of the model's skills across coding, computer use, long-context reasoning, agent planning, knowledge work, and design.