Claude Opus 4.5: Anthropic's Most Powerful Model Yet

This article is written in English. Our training modules are available in French.

On November 24, 2025, Anthropic released Claude Opus 4.5, their most intelligent model to date. With state-of-the-art performance on coding benchmarks, advanced computer use capabilities, and unprecedented context handling, Opus 4.5 represents a major leap in AI capability.

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Benchmark Performance

Claude Opus 4.5 delivers impressive results across key benchmarks:

SWE-bench Verified (Software Engineering): 80.9% — State-of-the-art

OSWorld (Computer Use): 66.3% — Autonomous computer interaction

GPQA Diamond (Graduate Reasoning): 89.2%

HumanEval (Code Generation): 92.1%

These scores represent significant improvements over previous Claude models and competitors.

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Key Capabilities

1. Advanced Coding & Agentic Workflows

Opus 4.5 excels at complex software engineering:

• →Long-horizon coding tasks: Multi-file refactoring, large-scale debugging
• →Plan-then-execute: Creates comprehensive plans before implementation
• →Iterative refinement: Improves code through multiple passes

Claude Code (Anthropic's coding product) now runs on Opus 4.5, available as a desktop app.

2. Computer Use & Automation

The model can autonomously interact with computers:

• →Navigate web browsers and desktop applications
• →Work with Excel, Chrome, and other software
• →New zoom action: Inspect screen regions in detail
• →Execute multi-step workflows across applications

3. Long-Context Understanding

Opus 4.5 handles extended interactions gracefully:

• →Automatic context summarization: Important information persists across long sessions
• →Preserved thinking blocks: Maintains reasoning continuity in multi-turn conversations
• →Full reasoning history available for complex, long-running tasks

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Working with Opus 4.5

The Effort Parameter

A unique feature of Opus 4.5 is the effort parameter, allowing you to control:

• →Token usage vs. response thoroughness
• →Reasoning depth vs. speed
• →Cost optimization for different use cases

Low effort → Quick responses, lower cost

High effort → Deep analysis, comprehensive output

Prompting Tips

1. →

   Leverage its planning ability:

   "Before implementing, create a detailed plan with file changes, dependencies, and potential issues."

2. →

   Use for multi-file tasks:

   "Refactor the authentication system across these 5 files, ensuring backwards compatibility."

3. →

   Enable self-verification:

   "After writing the code, review it for bugs and suggest improvements."

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Multimodal Strengths

Beyond text, Opus 4.5 excels at:

• →Vision tasks: Analyzing images, charts, and diagrams
• →Spreadsheet work: Complex Excel operations
• →Slide generation: Creating presentations
• →3D visualizations: Generating and describing 3D content
• →Long-form storytelling: 10-15 page coherent narratives

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Safety & Alignment

Anthropic emphasizes that Opus 4.5 is their most robustly aligned model:

• →Improved resistance to prompt injection
• →Better handling of malicious requests
• →Enhanced safety filters without compromising capability

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Key Takeaways

1. →Claude Opus 4.5 leads in coding and agentic benchmarks
2. →Computer use capabilities enable true automation
3. →The effort parameter provides cost/quality control
4. →Long-context handling is superior for extended projects
5. →Strong multimodal capabilities beyond text

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Master Complex Problem-Solving with AI

Claude Opus 4.5's planning and execution capabilities embody advanced prompting patterns—specifically the ability to decompose complex problems and execute sophisticated workflows.

In our Module 4 — Complex Problem Decomposition, you'll learn:

• →How to structure multi-step problems for AI consumption
• →MapReduce patterns for dividing and conquering
• →Complexity estimation techniques
• →Building execution pipelines with verification checkpoints
• →When to use monolithic vs. decomposed approaches

→ Explore Module 4: Complex Problem Decomposition