Claude Haiku 4.5 is the latest small AI model from Anthropic, offering enhanced speed and cost-efficiency compared to its predecessor Claude Sonnet 4. Launched on October 15, 2025, this model provides similar coding performance at one-third the cost and more than twice the speed, excelling in tasks such as computer use and real-time, low-latency applications like chat assistants and pair programming. It achieves 90% of Sonnet 4.5's performance and is particularly effective in sub-agent orchestration, making it a valuable tool for AI-assisted development. Safety evaluations indicate Claude Haiku 4.5 is more aligned and poses fewer risks than previous models, leading to its classification under AI Safety Level 2. Available through the Claude API, Amazon Bedrock, and Google Cloud’s Vertex AI, Haiku 4.5 serves as an economical replacement for both Haiku 3.5 and Sonnet 4, offering developers efficient code generation and a responsive AI experience.