Claude Sonnet 4.6 vs Claude Haiku 4.5

Sonnet 4.6 is Anthropic’s strongest Sonnet-class model to date, delivering frontier-level performance in coding, agentic tasks, and professional work. It shines in iterative development, navigating complex codebases, end-to-end project management with memory, creating polished documents, and reliable computer use for web QA and workflow automation.

Claude Haiku 4.5 is Anthropic’s fastest and most efficient model, offering near-frontier intelligence with much lower cost and latency than larger Claude models. It matches Claude Sonnet 4’s performance in reasoning, coding, and computer-use tasks, making it ideal for real-time and large-scale applications. Haiku 4.5 introduces controllable reasoning depth, supports summarized or interleaved thought outputs, and enables tool-assisted workflows across coding, bash, web search, and computer-use tools. With over 73% on SWE-bench Verified, it stands among the top coding models while maintaining fast responsiveness for sub-agents, parallel execution, and scaled deployment.