Explore the Capabilities of Claude Sonnet 4.5

Optimized for coding workflows and real-world agents.

Input: text · image · file Output: text Context: 1,000,000 tokens Release: 2025-09-29

Discover Claude Sonnet 4.5 by Anthropic, released on September 29, 2025. This advanced AI model excels in handling complex coding workflows and real-world agents with its extensive context window of 1,000,000 tokens. Supporting text, image, and file inputs, it outputs text, making it versatile for various applications. Key features include enhanced tool orchestration, speculative parallel execution, and efficient context management. Ideal for software engineering, cybersecurity, and financial analysis, Claude Sonnet 4.5 offers improved system design, code security, and specification adherence.

Use Cases

Here are a few ways teams apply Anthropic: Claude Sonnet 4.5 in practice—from fast drafting to multimodal understanding. Adapt these ideas to your workflow.

Streamline software engineering processes

Enhance cybersecurity measures

Conduct in-depth financial analysis

Support research agents with sustained reasoning

Facilitate complex coding workflows

Key Features

A quick look at the capabilities that make this model useful in real projects.

Extended context window of 1,000,000 tokens

Supports text, image, and file inputs

Enhanced tool orchestration capabilities

Efficient context and memory management

Speculative parallel execution

Improved code security and system design

Specs

Overview

Vendor
anthropic

Model ID
anthropic/claude-sonnet-4.5

Release
2025-09-29

Modalities & context

Input
text · image · file

Output
text

Context
1,000,000 tokens

Parameters & defaults

Supported parameters: include_reasoning, max_tokens, reasoning, stop, temperature, tool_choice, tools, top_k, top_p

Defaults: temperature 1, top_p 1

Benchmark tests: Anthropic: Claude Sonnet 4.5

We ran this model against a few representative prompts to show its range. Review the outputs below and be the judge.

Text

Prompt:

Write 150 words on how AI might positively upend work, leisure and creativity

# AI's Transformative Promise AI could fundamentally reimagine how we balance productivity and fulfillment. In work, it may eliminate tedious tasks—data entry, scheduling, routine analysis—freeing humans for strategic thinking and interpersonal connection. Rather than replacing workers, AI could become the ultimate collaborator, handling the mundane while we focus on what requires empathy, judgment, and innovation. For leisure, AI might personalize experiences in unprecedented ways: curating learning paths that adapt to our pace, generating interactive stories responsive to our choices, or creating virtual companions for exploration and conversation. In creativity, AI serves as an infinite brainstorming partner. Artists can iterate faster, writers can overcome blocks, and musicians can experiment with sounds previously unimaginable. It democratizes creative tools, allowing anyone to translate vision into reality regardless of technical skill. The key lies in viewing AI not as replacement but as amplification—technology that handles constraints so humans can explore possibilities, deepening both our productivity and our humanity.

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Image

Prompt:

Generate an SVG of a pelican riding a bicycle.

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up.end

/ˌəpˈend/

verb

To “upend” means to completely disrupt, overturn, or drastically change the established order or structure of something. It implies a significant shift or alteration that can potentially have far-reaching consequences. When something is upended, it is turned upside down or transformed in a way that challenges conventional norms or expectations. The term often carries a sense of innovation, transformation, and sometimes even a hint of upheaval, indicating that the changes are not just minor adjustments but rather a fundamental reimagining of the status quo.

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