Sonnet 4.5 is a chat model trained by Anthropic, with a knowledge cutoff of January 2025, and a context window of 1,000,000 tokens. You can configure the model's reasoning level.

Knowledge cutoffJan 2025
Context window1,000,000 tokens
Release dateSep 2025

Anthropic's best model for coding and complex tasks.

On Zo, you can choose between all the leading AI models for chatting, research, coding, and generating media. We believe in giving you the power to explore different models so that you can get the best results for any task.

Sonnet 4.5 on Zo Computer