Models / anthropic / Claude Sonnet 4.5 (2025-09-29)

Claude Sonnet 4.5 (2025-09-29)

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anthropicllm

A dated snapshot of Anthropic's Claude Sonnet 4.5 model for consistent API behavior.

texttool-usejson-modestreamingreasoningcode-generationfunction-callingprompt-cachingvision
homepage ↗docs ↗
Specs
Context & limits
200K
context window
64K
max output
Lifecycle
Dates
released2025-09-29
Resources
homepagehttps://www.anthropic.com ↗
docshttps://docs.anthropic.com/en/docs ↗