Discover Claude Opus 4.5 by Anthropic

Unlock advanced reasoning and multimodal capabilities for your projects.

Input: file · image · text Output: text Context: 200,000 tokens Release: 2025-11-24

Claude Opus 4.5, released by Anthropic on November 24, 2025, is a sophisticated reasoning model designed for complex software engineering tasks. With a context length of 200,000 tokens, it supports various input modalities including file, image, and text, and outputs text. This model excels in multimodal capabilities, advanced tool use, and coordinated multi-agent setups. It allows developers to optimize for speed, depth, and token usage, making it ideal for tasks such as autonomous research, debugging, and multi-step planning. With improved robustness against prompt injection and enhanced structured reasoning, Claude Opus 4.5 represents a significant advancement in AI capabilities for developers.

Use Cases

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

Enhance autonomous research capabilities

Streamline debugging processes

Facilitate multi-step planning tasks

Improve spreadsheet and browser manipulations

Execute reliable long-running tasks

Key Features

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

Optimized for complex software engineering tasks

Supports up to 200,000 tokens of context

Advanced tool use and multi-agent coordination

Robust against prompt injection

Customizable token efficiency settings

Specs

Overview

Vendor
anthropic

Model ID
anthropic/claude-opus-4.5

Release
2025-11-24

Modalities & context

Input
file · image · text

Output
text

Context
200,000 tokens

Parameters & defaults

Supported parameters: include_reasoning, max_tokens, reasoning, response_format, stop, structured_outputs, temperature, tool_choice, tools, top_k, verbosity

Defaults: temperature 0.2, top_p 0.95

Benchmark tests: Anthropic: Claude Opus 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

# The Bright Side of AI Disruption AI stands poised to fundamentally reimagine how we spend our time—potentially for the better. **Work** could shift from drudgery to meaning. As AI handles repetitive tasks, humans might focus on strategy, relationships, and problems requiring emotional intelligence. The four-day workweek becomes feasible when productivity doubles through intelligent automation. **Leisure** transforms when AI becomes a personalized concierge—curating experiences, planning travel, or serving as an endlessly patient teacher for new hobbies. Learning guitar, a new language, or chess becomes accessible through adaptive, judgment-free AI tutors available around the clock. **Creativity** perhaps benefits most surprisingly. Rather than replacing artists, AI serves as an infinite collaborator—helping writers overcome blocks, enabling non-musicians to compose, and democratizing tools once reserved for professionals. The barrier between imagination and execution shrinks dramatically. The optimistic vision isn't humans versus machines, but humans *amplified*—freed to pursue what makes us distinctly human: connection, curiosity, and creation.

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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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