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.
When not to use this
- Not ideal for sprawling research or brittle multi-hop reasoning unless you constrain scope tightly.
- Avoid for regulated or high-stakes outputs without evaluations that mimic your tooling, data, and review process.
- Promote traffic to heavier tiers inside the family when workflows need richer tools and longer horizons.
Technical specs
- Inputs
- text, image
- Outputs
- text
- Capabilities
- low latency, classification, routing
- License
- See vendor
- Model string
claude-3-5-haiku
Benchmarks
No benchmark data yet.
Anthropic Claude family lineup
Current models
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