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Very High Reasoning

Claude Sonnet 4

Claude Sonnet 4 is a powerhouse AI model excelling in coding, advanced reasoning, and agent workflows, achieving state-of-the-art 72.7% on SWE-bench while balancing superior performance with efficiency for high-volume tasks. Upgrade your development, automation, and production workflows with its precise instruction-following, speed, and scalability—ideal for everyday AI excellence.

1M Context
Very High Intelligence
Aug '25 Knowledge

Available for Chat, Vision, and File Uploads.

Performance Benchmarks

MMLU
86.5%
SWE-bench Verified
72.7%
MMMU
74.4%

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 Sonnet 4?

Impressive Reasoning

Delivers advanced reasoning for complex tasks like coding, analysis, and agentic workflows with sustained coherence and adaptive decision-making

High-Throughput Speed

Optimized for fast, efficient performance in real-time automation, production-scale deployments, and high-volume tasks like code reviews and AI assistants

Extended Tool Use

Supports parallel tool execution, memory improvements, and switching between reasoning and tools for autonomous agents and multi-step operations

Capability Examples

AI Assistant for Customer Support
User: A customer is upset about a delayed shipment. Respond empathetically and offer solutions.
AI: I'm sorry for the delay—tracking shows it arrives tomorrow. Would you like a $20 credit, expedited shipping on your next order, or a full refund? Let me know how to make this right.
Everyday Coding Assistance
User: Debug this Python function that's failing on large lists: def sum_even(lst): return sum(x for x in lst if x % 2 == 0)
AI: The function works but may hit recursion limits on huge lists. Optimized version with slicing: def sum_even(lst): return sum(lst[::2]) if lst else 0. Tests: sum_even([1,2,3,4]) == 6. Handles millions efficiently.

How to use

1
Go to Chat

Navigate to the "AI Chat" page.

2
Select Model

Ensure Claude Sonnet 4 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 Sonnet 4 better than Claude 3.5 or Gemini? Test same prompts simultaneously in the Chat Playground.

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