Claude Haiku 4.5

Claude Haiku 4.5 is Anthropic’s fastest model in the Claude family, released on 15 October 2025. It is a lightweight variant with near-frontier intelligence, offered at a lower price and high speed.

The model matches Claude Sonnet 4 on coding, computer use and agent tasks at about one-third the cost and more than twice the speed; it also runs up to 4–5× faster than Claude Sonnet 4.5. On SWE-bench Verified it scores 73.3% (with a 128K thinking budget).

It is multimodal — it accepts text and images and produces text. It supports a 200,000-token context window and up to 64,000 output tokens, as well as extended thinking. Its reliable knowledge cutoff is February 2025 (training data through July 2025).

API pricing is USD 1 per 1M input tokens and USD 5 per 1M output tokens. The model is available via the Claude API, Claude Code, Amazon Bedrock and Google Vertex AI. It was released under the AI Safety Level 2 (ASL-2) standard. Typical uses include fast real-time applications, customer service, multi-agent systems and coding sub-agents.