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Very High Reasoning

Claude Opus 4.1

Claude Opus 4.1 is Anthropic's state-of-the-art AI model, delivering a breakthrough 74.5% on SWE-bench Verified for superior coding accuracy, multi-file refactoring, and precise bug fixes. It excels in agentic reasoning, in-depth research, long-horizon tasks, and hybrid thinking, powering developers with seamless upgrades at the same pricing.

200k Context
Very High Intelligence
Jan '25 Knowledge

Available for Chat, Vision, and File Uploads.

Performance Benchmarks

MMMLU
89.5%
GPQA
80.9%
SWE-bench Verified
74.5%

How do you want to interact?

Start a Conversation

Ask anything.
Have a natural conversation, brainstorm ideas, draft emails, or ask for advice.

Start Chatting

Use a Persona

Specialized Experts.
Instruct the AI to act as a Coding Tutor, Marketing Expert, or Travel Guide.

Pick a Persona

Why use Claude Opus 4.1?

Improved Coding Accuracy

Achieves 74.5% on SWE-bench Verified with multi-file refactoring, precise bug fixes, and style adaptation

Enhanced Agentic Reasoning

Excels in long-horizon tool-assisted tasks, complex workflows, and synthesizing insights from external data

Advanced Research Capabilities

Improves in-depth research, data analysis, detail tracking, and agentic search

Capability Examples

Advanced Coding Refactoring
Refactor this multi-file Python codebase to fix the bug in user authentication while preserving the existing style: [provide sample code files here]
Here's the refactored code. Key changes: Updated auth module to handle JWT expiry correctly without altering database calls. Files updated: auth.py (lines 45-67), main.py (line 23). Tested for no regressions.
Agentic Data Analysis
Synthesize insights from these 50 patent filings on AI agents, identifying trends in tool use and reasoning capabilities, then suggest 3 enterprise applications.
Analysis: 68% patents emphasize long-horizon planning; top trend: hybrid reasoning with external tools. Applications: 1) Automated debugging pipelines (Rakuten-style), 2) Multi-step research synthesis, 3) Workflow automation with 74.5% SWE-bench precision.

How to use

1
Go to Chat

Navigate to the "AI Chat" page.

2
Select Model

Ensure Claude Opus 4.1 is selected.

3
Type Prompt

Ask a question or paste code.

4
Interact

Refine the answer by replying to the AI.

Compare LLMs Side-by-Side

Is Claude Opus 4.1 better than Claude 3.5 or Gemini? Test same prompts simultaneously in the Chat Playground.

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