by Anthropic
Fastest Claude model with near-Sonnet quality. Extended thinking, computer use, image understanding. One-third the cost of Sonnet.
Claude 4.5 Haiku by Anthropic (October 2025) is the fastest model in the Claude family with near-Sonnet 4 quality. It's the first Haiku to support extended thinking, computer use, and image understanding.
Haiku: classification, extraction, summarization, simple Q&A, high-volume processing
Sonnet: creative writing, complex analysis, nuanced reasoning, multi-file code changes
Haiku is excellent at fast structured extraction:
Extract the following from this customer email:
- Sentiment: positive/negative/neutral
- Product mentioned: [product name or "none"]
- Action needed: [one sentence]
- Priority: high/medium/low
Email: """[paste email]"""
For tasks that need reasoning, enable thinking:
Think step by step about this math problem before answering.
[problem]
Haiku's speed makes it ideal for batch operations:
For each of the following 20 product descriptions, generate:
1. A one-line tagline (under 10 words)
2. 3 SEO keywords
3. Target audience (one phrase)
Format as JSON array.
| Use Case | Quality | Speed |
|---|---|---|
| Text classification | Excellent | Very Fast |
| Data extraction | Excellent | Very Fast |
| Summarization | Very Good | Very Fast |
| Code generation | Good | Very Fast |
| Creative writing | Fair | Very Fast |
| Complex reasoning | Good (with thinking) | Fast |
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