The balance of power in the AI world is shifting once again. Yesterday (November 24, 2025), Anthropic announced Claude Opus 4.5, the most powerful model they have developed to date. Following in the footsteps of Sonnet and Haiku, this flagship is not merely a simple chatbot; it is an autonomous "agent" capable of managing complex tasks. It is redefining standards, particularly in software development and strategic planning.
Performance Pushing Boundaries: Coding and Agent Capabilities
Opus 4.5 is defined as Anthropic's most capable model to date, and it proves this claim with superior success, particularly in technical tasks. The model's architecture is built not just for generating text, but for taking action and solving complex problems through multi-step processes.
The New Leader in Software Engineering
For developers, Opus 4.5 is a true turning point. It has reached the summit by achieving an 80.9% success rate in the SWE-bench Verified tests, which measure software engineering capabilities. This score demonstrates that the model doesn't just write snippets of code; it can perform complex debugging, refactoring, and comprehensive feature development tasks with the precision of an autonomous engineer. With GitHub Copilot or Claude Code integrations, it can drive projects from end to end.
Autonomous Computer Use
The "Computer Use" capability has reached maturity with Claude Opus 4.5. Achieving a 66.3% success rate in OSWorld tests, the model perceives the screen just like a human does. It can conduct research in a browser, process data into Excel, and then enter it into an internal CRM system. Its ability to analyze pixels and manage the keyboard and mouse is revolutionizing office automation.
Access, Cost, and Optimal Use Cases
With this model, Anthropic has increased intelligence while reducing costs, giving control back to the user via the "Effort" parameter. You can now adjust the balance between speed and intelligence according to your needs.
Affordable Pricing and "Effort" Control
The rule that the most powerful models must be expensive has been broken. Claude Opus 4.5 is significantly more accessible than the previous generation Opus 3: $5 for input and $25 for output (per 1 million tokens). Furthermore, thanks to the new "Effort" parameter, you can achieve cost savings by determining how long the model should think about a problem (low/medium/high). The model is immediately accessible via Claude.ai, AWS, Google, and Azure.
When Should You Choose Opus 4.5?
It may not be necessary to use the most powerful model for every task. Here are 3 fundamental situations where you should switch to Opus 4.5:
- Complex Coding: When refactoring operations affecting the entire project or the detection of hard-to-find "bugs" are required, rather than simple scripts.
- Autonomous Agent Tasks: For jobs requiring the model to view the screen, click, and move data between different applications (like from Excel to the web).
- Managing Ambiguity: In deep analysis processes where there are no clear instructions, and the model needs to take initiative and make strategic decisions.
