Claude Haiku 4.5vsClaude 3.5 Haiku
Anthropic vs Anthropic — Side-by-side model comparison
Head-to-Head Comparison
| Metric | Claude Haiku 4.5 | Claude 3.5 Haiku |
|---|---|---|
| Provider | ||
| Arena Rank | #15 | #12 |
| Context Window | 200K | 200K |
| Input Pricing | $1.00/1M tokens | $0.80/1M tokens |
| Output Pricing | $5.00/1M tokens | $4.00/1M tokens |
| Parameters | Undisclosed | Undisclosed |
| Open Source | No | No |
| Best For | Fast responses, classification, extraction | Fast coding, data extraction, classification |
| Release Date | Oct 1, 2025 | Oct 29, 2024 |
Claude Haiku 4.5
Claude Haiku 4.5 is Anthropic's fastest and most affordable model in the Claude family, designed for high-throughput applications where speed and cost-efficiency are paramount. Despite being the lightest model in the lineup, it delivers surprisingly strong performance on classification, extraction, summarization, and simple reasoning tasks. With a 200K context window and pricing at just $1.00 per million input tokens, it's ideal for processing large volumes of data quickly — from customer support triage to content moderation to data extraction. Haiku 4.5 responds in milliseconds, making it suitable for real-time applications where users expect instant responses. It's the go-to choice for builders who need Claude's safety and quality characteristics at scale.
View Anthropic profile →Claude 3.5 Haiku
Claude 3.5 Haiku is Anthropic's fastest and most affordable model in the Claude 3.5 family, designed for high-throughput tasks that require quick, intelligent responses. Despite its speed, it delivers surprisingly strong performance on coding, data extraction, and classification tasks, often matching or exceeding larger models from competitors. With a 200K context window, it can process substantial documents while maintaining rapid response times, making it ideal for real-time applications and high-volume API use cases.
View Anthropic profile →Key Differences: Claude Haiku 4.5 vs Claude 3.5 Haiku
Claude 3.5 Haiku ranks higher in arena benchmarks (#12) indicating stronger overall performance.
Claude 3.5 Haiku is 1.3x cheaper on average, making it the better choice for high-volume applications.
When to use Claude Haiku 4.5
- +Quality matters more than cost
- +Your use case involves fast responses, classification, extraction
When to use Claude 3.5 Haiku
- +You need the highest quality output based on arena rankings
- +Budget is a concern and you need cost efficiency
- +Your use case involves fast coding, data extraction, classification
Cost Analysis
At current pricing, Claude 3.5 Haiku is 1.3x more affordable than Claude Haiku 4.5. For a typical enterprise workload processing 100M tokens per month:
Claude Haiku 4.5 monthly cost
$300
100M tokens/mo (50/50 in/out)
Claude 3.5 Haiku monthly cost
$240
100M tokens/mo (50/50 in/out)
The Verdict
Claude 3.5 Haiku wins our head-to-head comparison with 3 out of 5 category wins. It's the stronger choice for fast coding, data extraction, classification, though Claude Haiku 4.5 holds an edge in fast responses, classification, extraction.
Last compared: March 2026 · Data sourced from public benchmarks and official pricing pages