Claude Sonnet 4.5
The best coding model in the world
A Claude Sonnet model release positioned for coding, agentic work, and computer use.
Pricing
Official site · Sep 28, 2026, 6:38 AM
Input / 1M
$3.00
Output / 1M
$15.00
Cached input / 1M
$0.30
Prompt cache 5-minute writes: $3.75/MTok; 1-hour writes: $6/MTok; cache hits and refreshes: $0.30/MTok.
Anthropic's official pricing documentation lists Claude Sonnet 4.5 at $3 per million input tokens and $15 per million output tokens. Prompt caching is separately listed at $3.75/MTok for 5-minute writes, $6/MTok for 1-hour writes, and $0.30/MTok for cache hits and refreshes.
Model Intelligence
Context window
200,000 tokens
Arena ranking
19
Benchmarkable
Yes
Model level
release
Intelligence Index
19.3
Math Index
37
MMLU Pro
0.86
GPQA
0.73
HLE
0.07
LiveCodeBench
0.59
AIME 2025
0.37
IFBench
0.43
LCR
0.54
TerminalBench Hard
0.29
TAU2
0.7
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