Anthropic

Available in Shortly AI

Claude Sonnet 4.5

Released September 29, 2025

ReasoningVision (Image)Tool Use

Claude Sonnet 4.5 is the newest model in the Sonnet series, offering improvements and updates over Sonnet 4.

Context window: 1M tokens
Maximum output: 64K tokens
Input pricing: $3.00/M
Output pricing: $15.00/M

Independent benchmark

LiveBench historical snapshot

59.2overall

Historical benchmark data from LiveBench, release 2025-12-23. Scores are pinned and are not fetched on page load.

42.3

76.1

48.3

80.8

67.3

76.0

23.5

Benchmarks measure selected evaluation tasks and do not guarantee performance for every prompt or workflow.

FAQ

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