Claude Haiku 4.5vsClaude 3.5 Sonnet

Claude Haiku 4.5 is Anthropic's fastest and most affordable model in the Claude family, designed for high-throughput applications where speed and cost-efficiency are paramount. Despite being the lightest model in the lineup, it delivers surprisingly strong performance on classification, extraction, summarization, and simple reasoning tasks. With a 200K context window and pricing at just $1.00 per million input tokens, it's ideal for processing large volumes of data quickly — from customer support triage to content moderation to data extraction. Haiku 4.5 responds in milliseconds, making it suitable for real-time applications where users expect instant responses. It's the go-to choice for builders who need Claude's safety and quality characteristics at scale.

Claude 3.5 Sonnet was Anthropic's previous generation balanced model that set new industry benchmarks when released. It demonstrated that mid-tier models could compete with and even surpass flagship models from competitors on coding, reasoning, and analysis tasks. The model featured a 200K token context window and introduced Anthropic's Artifacts feature for interactive code execution. Claude 3.5 Sonnet became one of the most popular models for professional developers and enterprises, known for its excellent code generation, careful instruction following, and reduced hallucination rates. While now succeeded by Claude Sonnet 4, it remains widely deployed in production systems and continues to offer strong performance at its price point. It was instrumental in establishing Anthropic as a serious competitor to OpenAI.