Claude 3.5 Haiku
Claude 3.5 Haiku is Anthropic’s fast, cost-efficient tier for high-volume classification, routing, and simple chat.
Newer version: Claude Haiku 4.5
Provider
Anthropic
Model family
Anthropic Claude
LLM
Cost tier
Haiku
Status
Legacy
Why teams choose it
Complex reasoning
Useful for workflows that require structured thinking, multi-step logic, and deeper analysis than lightweight models provide.
Long-context analysis
Helps teams summarize, compare, and extract insights from long documents without losing important nuance.
Coding and tools
Works well for code assistance, tool calling, and agent workflows where instructions must stay consistent across steps.
Cost-efficient routing
Useful as part of a routing stack where cheap models handle drafts and confirmations and this tier handles genuinely hard passages.
Tradeoffs to know
- Reasoning depth below Sonnet—don’t route hardest tasks here.
- Quota and regional availability vary.
Technical specs
- Inputs
- text, image
- Outputs
- text
- Capabilities
- low latency, classification, routing
- License
- See vendor
Benchmarks
No independent or vendor benchmark scores in this catalog entry.
Anthropic Claude family lineup
Current models
Previous versions
Related models
Claude 3.5 Haiku FAQ
What is Claude 3.5 Haiku?
Claude 3.5 Haiku is Anthropic’s fast, cost-efficient tier for high-volume classification, routing, and simple chat. It targets latency-sensitive paths and agent pre-processing before escalating to Sonnet-class models.
When does Claude 3.5 Haiku fit best?
Real-time chat guardrails
What should teams watch out for with Claude 3.5 Haiku?
Reasoning depth below Sonnet—don’t route hardest tasks here.
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