Claude Sonnet 4.5 (2025-09-29)
JSON →A dated snapshot of Anthropic's Claude Sonnet 4.5 model for consistent API behavior.
Specs
context window 200K tokens
max output 64K tokens
input price $3 / 1M tokens
output price $15 / 1M tokens
Capabilities
tool-usejson-modestreamingreasoningcode-generationfunction-callingprompt-cachingvision
Dates
releasedSep 2025
Resources
homepagewww.anthropic.com ↗