Claude Haiku 4.5
Claude Haiku 4.5 is Anthropic's fastest modern frontier model, optimized for cheap high-throughput work without giving up much general quality. It is a strong default for summaries, classification, routing, and lightweight automation at scale.
- Very fast responses
- Strong value at scale
- Excellent for summaries and routing
- Good for automation-heavy workflows
- Weaker than larger models on complex reasoning
- Not ideal for hard scientific or coding tasks
- Needs clearer instruction for nuanced outputs
- Not the best fit for deep strategic reasoning
Best fit
- summaries
- classification
- support ops
- light automation
- frontier coding
- deep technical analysis
- hard research synthesis
At a glance
Category research paths
Strong alternatives
Comparisons featuring Claude Haiku 4.5
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