Claude Opus 4.5

Late classic-tokenizer Opus with a 200K context window.

API model ID	`claude-opus-4-5-20251101`
Context window	200K tokens
Max output	64K tokens
Input price	$5 per million tokens
Output price	$25 per million tokens
Knowledge cutoff	May 2025
Released	Nov 24, 2025
Tokenizer generation	Classic (Sonnet 4.6 and earlier)
Status	Active

From the announcement

The big Opus price drop, to $5 input / $25 output per MTok.
Scored higher than any human candidate ever on Anthropic's internal 2-hour engineering exam.

Read Anthropic's announcement

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