Claude Opus 4.5 – Anthropic’s latest AI programming model

What is Claude Opus 4.5?

Claude Opus 4.5 is Anthropic’s newest advanced AI model. It excels in programming, system-level tasks, everyday research, and document processing, and is particularly strong at handling complex software engineering problems—outperforming human-level benchmarks in multiple tests. The model demonstrates powerful creative problem-solving capabilities and handles complex scenarios with ease.Claude Opus 4.5 also delivers major improvements in safety, with significantly enhanced resistance to malicious attacks. Through efficiency optimizations and new features such as dynamic tool discovery and improved context management, the model becomes more flexible and efficient when handling tasks.Claude Opus 4.5 is now available across the app, API, and major cloud platforms. Developers can access it through the Claude API using claude-opus-4-5-20251101, priced at $5 / $25 per million tokens, allowing more users and teams to easily experience its capabilities.

Key Features of Claude Opus 4.5

• Programming & Code Generation:
Excels across multiple programming languages, generating high-quality code and solving complex problems—ideal for software development and code optimization.

• Agentic Task Handling:
Efficiently manages multiple sub-agents and builds sophisticated multi-agent systems.

• Natural Language Processing:
Understands ambiguous requirements and complex instructions; strong in research, document processing, and language-related tasks.

• Creative Problem Solving:
Generates innovative solutions for complex challenges, often exceeding traditional approaches and expected results.

• Safety & Alignment:
More resilient to attacks with improved safeguards against misuse and prompt-injection attacks.

• Efficiency Optimization:
Reduces token usage and introduces the effort parameter for more efficient and flexible task execution.

• Long Conversations & Context Management:
Supports extended conversations with automatic context summarization to prevent context breaks—ideal for sustained interactions.

• Tool Integration & Dynamic Tool Use:
Supports dynamic tool discovery and programmatic tool invocation, enabling efficient management of complex toolchains while reducing context overload.

Performance of Claude Opus 4.5

Software Engineering Benchmarks

• SWE-bench Verified:
  Scored above 80%, becoming the first model ever to reach this level and surpassing all other cutting-edge models.

• SWE-bench Multilingual:
  Ranked #1 in 7 out of 8 programming languages in code quality.

• Internal Hard Tests:
  Outperformed all human candidates in a high-difficulty two-hour software engineering evaluation.

Agentic Task Benchmark (τ²-bench)

• Showed strong creative adaptation; e.g., in an airline customer service scenario, Claude Opus 4.5 proposed upgrading a ticket before rebooking the flight to optimize the solution.

Efficiency Tests

• Token Optimization:
  At medium effort, matches Sonnet 4.5’s best SWE-bench Verified score while reducing output tokens by 76%.

• Maximum Effort:
  Outperforms Sonnet 4.5 by 4.3 percentage points, while cutting 48% of output tokens.

• Dynamic Tool Calling:
  With the Tool Search Tool, reduces token usage by ~85%, greatly improving tool-call efficiency.

Project Page for Claude Opus 4.5

Official page: https://www.anthropic.com/news/claude-opus-4-5

Expanded Features of Claude Opus 4.5

Claude Code

Plan Mode now generates more precise execution plans; desktop app support enables running multiple local or remote sessions simultaneously.

Claude for Excel & Chrome

The Claude for Excel beta has expanded, bringing access to more users. Claude for Chrome is now available to all Max users, enabling direct task execution and cross-tab workflows inside the browser.

Long Conversation Support

Claude’s application layer now supports extended conversations with automatic summarization of early context, preventing conversation breaks—ideal for complex, multi-step interactions.

Use Cases for Claude Opus 4.5

• Software Development & Programming:
With top-tier multilingual coding performance, it generates high-quality code for development, optimization, and solving complex engineering problems.

• Agentic Automation & System Control:
Manages multiple sub-agents to build advanced multi-agent workflows—perfect for automation and system-level tasks.

• Document Processing & Research:
Handles long documents, complex PPT creation, and deep research tasks with high accuracy.

• Data Analysis & Excel Workflows:
With enhanced Claude for Excel support, it efficiently processes complex datasets and spreadsheet tasks.