Anthropic's fast, inexpensive tier for high-volume and latency-sensitive work.
Haiku 4.5 is Anthropic's fast, inexpensive tier, built for latency-sensitive and high-volume production rather than frontier reasoning. It offers solid quality for its class and carries Anthropic's safety posture, which matters to teams with compliance or reliability requirements.
Its constraints are straightforward. The context window is the smallest in the Claude line at roughly 200K tokens — ample for most chat and task workloads but short of the 1M-class models for long documents — and public per-token pricing is not consistently listed, so confirm current rates before planning at volume. It is not designed for the hardest problems.
For high-throughput, cost-sensitive applications that still want Claude-family behavior and safety, Haiku 4.5 is the natural entry point, with Sonnet 5 the step up when a task needs more depth or context.
FIELD NOTE — Optimized for speed and cost rather than deepest reasoning.
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