Claude Haiku 4.5 released as faster, cheaper AI for real-time use

Anthropic on Wednesday released Claude Haiku 4.5, a smaller, faster version of its Claude family of AI models that the company says delivers near-midsize coding and agentic performance while lowering costs and latency. Haiku 4.5 is available immediately on the Claude.ai web platform, the Claude mobile app, the Claude for Chrome extension, and through Anthropic’s API, and it will be the default model on all free Claude plans.

Anthropic published benchmark results and internal evaluations showing Haiku 4.5 matching or approaching the coding and tool-use capabilities of its earlier Sonnet model while running faster and cheaper. In company testing Haiku scored 73 on SWEBench verified and 41 on TerminalBench. Anthropic said Haiku 4.5 achieves roughly 90 percent of the agentic coding performance of Sonnet 4.5 on its internal evaluation and runs significantly faster, with the company describing cost reductions to roughly one third of the price of Sonnet-level models. The firm also reported that Haiku can operate more than twice as fast as some larger siblings and, in separate statements, that it can run up to 45 times faster in certain configurations.