Claude Sonnet 4.5

Anthropic Claude 4.5 September 1, 2025

Anthropic's latest AI model (September 2025) acclaimed for exceptional performance in real-world applications, coding, and computer use. Features improved alignment, reduced sycophancy and deception, and can autonomously perform tasks for over 30 hours.

Model Capabilities

Input

Accepted Formats

Text

Input Length

Context Window: 200K Tokens

Output

Generated Formats

Text

Output Length

Max Output: Not disclosed Tokens

Core Features & Strengths

Function Calling / Tools

What is it good for?

Primary Use Cases

Tool Integration: API calls, data processing, automated workflows

Long Documents: Research papers, books, large codebases analysis

Content Creation: Writing, editing, summarization, translation

Code Assistance: Programming help, debugging, code review

Best For

Business Applications: Customer service, content generation

Specifications & Pricing

Specifications

Model Size: Unknown params

Architecture: N/A

Open Source:No

Pricing

Input / 1M tk

N/A

Output / 1M tk

N/A

Est. cost in USD

Usage Guidance

How to Prompt This Model

✨ General Tips

🎯Be Specific: Detail the desired outcome, format, tone, and constraints.

🎭Set Context: Explain your role or the purpose (e.g., "Act as a helpful architect...").

📝Specify Format: Request bullet points, JSON, markdown, code blocks, etc.

🔄Iterate: Refine prompts based on responses. Don't expect perfection first try.

🚀 Best Practices for Claude Sonnet 4.5

Large Context Window

Leverage the 200K context by including full documents, multiple examples, or comprehensive background information.

Function Calling

Describe your goal naturally. The model will determine which tools to use and in what order.

📋 Example Prompts

Content Creation Example

Write a professional email to a client explaining a project delay. The project is a website redesign, the delay is due to additional security requirements, and the new timeline is 2 weeks. Keep the tone apologetic but confident.

Function Calling Example

I need to schedule a team meeting for next Tuesday at 2 PM. First check everyone's availability, then book a conference room that fits 8 people, and finally send calendar invites to the team.

Long Document Analysis

[Attach full research paper]\n\nAnalyze this research paper and provide:\n1. A 3-sentence summary of the main findings\n2. List of 5 key methodologies used\n3. Potential limitations or biases\n4. How this relates to current industry practices\n5. Actionable insights for a product manager

← Back to Models Directory