Claude Haiku 4.5

Anthropic · October 2025

The fastest and cheapest Claude. Built for short questions and quick replies.

Best for: Everyday chat

Context window
200,000 tokens
≈ 150,000 words · about 600 pages
Max output
64,000 tokens
≈ 48,000 words in a single answer
Knowledge cutoff
February 2025
its training cutoff

Modalities

TextInput and output
ImageInput only
AudioNot supported
VideoNot supported

Features

StreamingSupported
Function callingSupported
Structured outputsSupported
Fine-tuningNot supported

Tools

Web searchSupported
Code interpreterNot supported

Ready to try it?

Polymeti is currently invite-only.

Request an invitation

Bring your own API key · Your chats stay in your browser