Claude Opus 4.1

by Anthropic

Claude Opus 4.1 is a model from Anthropic, released on August 5, 2025. It has a 200K-token context window and can generate up to 32K output tokens. API pricing is $15 per 1M input tokens and $75 per 1M output tokens.

Claude Opus 4.1 is a hybrid reasoning model that pushes the frontier for coding and AI agents, featuring a 200K context window. It delivers superior performance and precision for real-world coding and agentic tasks, handling complex multi-step problems with rigor and attention to detail. With extended thinking capabilities, it offers instant responses or extended step-by-step thinking visible through user-friendly summaries. It advances state-of-the-art coding performance to 74.5% on SWE-bench Verified, excels at agentic search and research, and produces human-quality content with exceptional writing abilities. It supports 32K output tokens and adapts to specific coding styles while delivering exceptional quality for extensive generation and refactoring projects.

Key specs

ProviderAnthropic
Release date2025-08-05
Licenseproprietary
Context window200K tokens
Max output32K tokens
Input price$15 / 1M tokens
Output price$75 / 1M tokens
Intelligence Score29.8
Coding index21.3

Quick answers

What is the context window of Claude Opus 4.1?

Claude Opus 4.1 has a context window of 200K tokens, with a maximum output of 32K tokens per response.

How much does Claude Opus 4.1 cost?

Claude Opus 4.1 costs $15 per 1M input tokens and $75 per 1M output tokens through the API.

Is Claude Opus 4.1 open source?

No. Claude Opus 4.1 is a proprietary model from Anthropic (proprietary license).

When was Claude Opus 4.1 released?

Anthropic released Claude Opus 4.1 on August 5, 2025.

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