Anthropic: Claude Haiku 4.5 API
Claude Haiku 4.5 is Anthropic's fastest and most cost-effective small model. As the entry-level offering in the 4.5 series, it represents a generational leap: its performance in coding and agentic tasks now matches that of the previous state-of-the-art Claude 3.5 Sonnet. Designed for high-volume, latency-sensitive applications like real-time translation, coding sub-agents, and large-scale financial analysis, it is the first Haiku model to natively support "Extended Thinking (CoT)" and "Computer Use," significantly enhancing accuracy in complex reasoning tasks.
- Context window: 200,000 tokens
- Max output: 64,000 tokens
- Input: text, image
- Output: text
- Reasoning: Supported
- Tool calling: Supported
- File input: Supported
- Released: 2025-10-01
- Knowledge cutoff: 2025-01-31
Frequently Asked Questions
What is the context window of Claude Haiku 4.5?
Claude Haiku 4.5 supports a context window of up to 200,000 tokens.
Does Claude Haiku 4.5 support function calling?
Yes. Claude Haiku 4.5 supports tool / function calling.
Does Claude Haiku 4.5 support reasoning?
Yes. Claude Haiku 4.5 is a reasoning-capable model.
What is the knowledge cutoff of Claude Haiku 4.5?
The knowledge cutoff of Claude Haiku 4.5 is 2025-01-31.