Claude Haiku 4.5
The fastest, most affordable coding model
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Claude Haiku 4.5 is Anthropic's fast, low-cost small model. It matches the coding performance of Claude Sonnet 4, a model that was recently a frontier release, while running about twice as fast and costing roughly a third as much.
That makes it suited to high-volume and latency-sensitive work: coding assistants, agent loops that make many calls, real-time features, and tasks where cost per request matters at scale.
It is aimed at developers and businesses who need strong capability, particularly on code, but at a price and speed that works for production traffic, and is available through Anthropic's API and apps.
AI-assisted draft, human-reviewed before publishing — see how we choose & review tools.
Why we picked it
Haiku 4.5 earns its spot for matching a recently-frontier model's coding performance at a third of the cost and twice the speed — that specific combination is worth naming for anyone running an agent loop that makes many calls, where the model choice is really a cost decision.
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