Claude Haiku 4.5 (latest)

Claude Haiku 4.5 is the latest entry in Anthropic's small-model Haiku family, designed as a fast, cost-efficient counterpart to the larger Sonnet and Opus lines. It is positioned for latency-sensitive, high-volume workloads such as customer support, classification, extraction, and agentic pipelines where response speed and price matter more than frontier reasoning depth. Anthropic equips it with extended thinking support, allowing the model to allocate additional reasoning effort when prompts warrant it, rather than running strictly in a single-pass mode.

Qualitative comparisons against Anthropic's larger Claude Sonnet 5 show Haiku 4.5 trailing on coding tasks but leading on cost efficiency, while still delivering strong reasoning parity and matching multimodal input handling. It shares the same text, image, and PDF input modalities as its siblings, making it straightforward to drop into existing Claude-based stacks that need a lighter, cheaper runtime. The practical fit is a high-throughput model that preserves multimodal understanding and tool use, ideal for orchestrating many short requests or powering background agents behind a more capable primary model.