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Claude 4 Opus

Anthropic Released May 2025

Anthropic's flagship model, world's best coding model with multi-hour agentic workflows

Claude 4 Opus

Anthropic • May 2025

Training Data

Up to early 2025

Claude 4 Opus

May 2025

Parameters

~500 billion

Training Method

Constitutional AI

Context Window

200,000 tokens

Knowledge Cutoff

April 2025

Key Features

World's Best Coding • Multi-hour Workflows • Extended Thinking

Capabilities

Coding: Outstanding (72.5% SWE-bench)

Reasoning: Maximum

Persistence: Outstanding

What's New in This Version

World's best coding model with ability to work continuously for several hours

Anthropic's flagship model, world's best coding model with multi-hour agentic workflows

What's New in This Version

World's best coding model with ability to work continuously for several hours

Technical Specifications

Parameters ~500 billion
Context Window 200,000 tokens
Training Method Constitutional AI
Knowledge Cutoff April 2025
Training Data Up to early 2025

Key Features

World's Best Coding Multi-hour Workflows Extended Thinking

Capabilities

Coding: Outstanding (72.5% SWE-bench)
Reasoning: Maximum
Persistence: Outstanding

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Official Documentation Compare with Other Models View Timeline All Anthropic Models