Claude Sonnet 4.5

Anthropic · Claude Sonnet 4.5

Released

Sep 29, 2025

Context window

1,000,000 tokens

Max output

64,000 tokens

Input price

$3.00 / 1M

Output price

$15.00 / 1M

Knowledge cutoff

Apr 2025

API identifier

claude-sonnet-4-5-20250929

Provider: anthropic

See how Claude Sonnet 4.5 performs on the prompts that matter to you. YourBench tests them automatically when new models launch.