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Anthropic ↗Released May 22, 2025

Claude Opus 4

#1 Arena RankUndisclosed parameters

Claude Opus 4 ranks in the top 10 on the Arena leaderboard. Context window: 0.2K tokens.

Context

200K

Input

$5.00

Key Specifications

🏆

Arena Rank

#1

📐

Context Window

200K

📥

Input Price

per 1M tokens

$5.00

📤

Output Price

per 1M tokens

$25.00

🧠

Parameters

Undisclosed

🔒

Open Source

No

Best For

Complex reasoningcodingagentic tasks

About Claude Opus 4

Claude Opus 4 is Anthropic's most powerful AI model, holding the #1 position on the Chatbot Arena leaderboard. It represents a breakthrough in extended thinking and agentic capabilities, able to work autonomously on complex multi-step tasks for hours. With a 200K token context window, it excels at analyzing entire codebases, lengthy legal documents, and research papers in a single pass. The model demonstrates exceptional performance in coding (setting new benchmarks on SWE-bench), advanced reasoning, and nuanced writing tasks. Its agentic capabilities allow it to use tools, navigate computers, and execute multi-step workflows with minimal human oversight. Opus 4 is the preferred choice for enterprises requiring the highest quality output on mission-critical tasks where accuracy and depth matter more than speed or cost.

Built byAnthropic↗

Pricing per 1M tokens

Input Tokens

$5.00

Output Tokens

$25.00

Compare Claude Opus 4

See how Claude Opus 4 stacks up against other leading AI models

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Frequently Asked Questions

What is Claude Opus 4?▾
Claude Opus 4 is Anthropic's most powerful AI model, holding the #1 position on the Chatbot Arena leaderboard. It represents a breakthrough in extended thinking and agentic capabilities, able to work autonomously on complex multi-step tasks for hours. With a 200K token context window, it excels at analyzing entire codebases, lengthy legal documents, and research papers in a single pass. The model demonstrates exceptional performance in coding (setting new benchmarks on SWE-bench), advanced reasoning, and nuanced writing tasks. Its agentic capabilities allow it to use tools, navigate computers, and execute multi-step workflows with minimal human oversight. Opus 4 is the preferred choice for enterprises requiring the highest quality output on mission-critical tasks where accuracy and depth matter more than speed or cost.
How much does Claude Opus 4 cost?▾
Input pricing for Claude Opus 4 is $5.00 per million tokens; output runs $25.00. Token-based pricing means you can scale up or down without a fixed commitment.
What is Claude Opus 4's context window?▾
The context window for Claude Opus 4 is 200K tokens. That's the maximum amount of text you can feed into a single prompt, including system instructions, conversation history, and the actual query.
Is Claude Opus 4 open source?▾
Claude Opus 4 is closed-source and accessible only via Anthropic's API. Proprietary models trade deployment flexibility for convenience — Anthropic handles the infrastructure.
What is Claude Opus 4 best for?▾
The sweet spot for Claude Opus 4 is: Complex reasoning, coding, agentic tasks. If your workload fits one of these categories, it's worth benchmarking against alternatives.