Claude Opus 4.1

Deprecated: Anthropic retires this model on Aug 5, 2026. Migrate to Opus 4.8.

API model ID	`claude-opus-4-1-20250805`
Context window	200K tokens
Max output	32K tokens
Input price	$15 per million tokens
Output price	$75 per million tokens
Knowledge cutoff	Jan 2025
Released	Aug 5, 2025
Tokenizer generation	Classic (Sonnet 4.6 and earlier)
Status	Deprecated. Retires Aug 5, 2026. Migrate to Opus 4.8.

From the announcement

Pushed SWE-bench Verified to 74.5%.

Read Anthropic's announcement

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