Claude Opus 5.5
vendorAnthropic · claude-opus-5-5 · prices updated September 29, 2026
Input · 1M tokens
$4
Cached input · 1M
$0.2−95%
Output · 1M tokens
$20
Price history
inputoutput
Specifications
Context window1,000,000
Knowledge cutoffJun 2026
Tokenizertiktoken (cl100k_base)
Batch API−50% off the price
Tools
Web SearchCode InterpreterComputer UseMCP
Exact token counts: local tiktoken tokenizer (cl100k_base). Tool calls are billed by the provider separately.
About the model
Current flagship Opus (2026-09-22); cache reads at 0.05× input; 1M context