Anthropic Claude: Claude Haiku 5.5 API
Claude Haiku 5.5 is Anthropic's model for high-volume, latency-sensitive work such as classification, routing, extraction, and subagent tasks, with adaptive thinking steered by the effort parameter, a 1M-token context window, and up to 128K output tokens.
- Context window: 1,000,000 tokens
- Max output: 128,000 tokens
- Input: text, image, file
- Output: text
- Reasoning: Supported
- Tool calling: Supported
- File input: Supported
- Released: 2026-10-07
- Knowledge cutoff: 2026-06-30
Frequently Asked Questions
What is the context window of Claude Haiku 5.5?
Claude Haiku 5.5 supports a context window of up to 1,000,000 tokens.
Does Claude Haiku 5.5 support function calling?
Yes. Claude Haiku 5.5 supports tool / function calling.
Does Claude Haiku 5.5 support reasoning?
Yes. Claude Haiku 5.5 is a reasoning-capable model.
What is the knowledge cutoff of Claude Haiku 5.5?
The knowledge cutoff of Claude Haiku 5.5 is 2026-06-30.