Claude Opus 4.5
Claude Opus 4.5 is Anthropic's most powerful frontier model, delivering record-breaking 80.9% SWE-bench performance and advanced autonomous agency for coding.
anthropicClaude 4November 24, 2025About Claude Opus 4.5
Learn about Claude Opus 4.5's capabilities, features, and how it can help you achieve better results.
Claude Opus 4.5 is the flagship model from Anthropic, released in late 2025. It is specifically designed for complex software engineering and high-stakes reasoning. The model achieved a record-breaking 80.9% on the SWE-bench Verified benchmark, making it a primary choice for autonomous debugging and system refactoring. It introduces a refined persona emphasizing diplomatic honesty and nuanced helpfulness.
Multimodal and Agentic Optimization
The architecture supports a 200,000-token context window and a 64,000-token output limit. Developers can use a specialized effort parameter to scale reasoning depth against computational costs. This flexibility allows for high-intensity logic tasks or faster, more economical creative drafting. The model is multimodal, excelling at interpreting architectural diagrams and dense UI layouts.
Engineering and Tool Use
Optimized for agentic workflows, it navigates terminal environments via Claude Code to perform system-wide audits. It reduces input and output pricing significantly compared to earlier flagship iterations. Its ability to maintain coherence across long-horizon tasks positions it as a reliable partner for professional engineering teams and complex data analysis.
Use Cases
Discover the different ways you can use Claude Opus 4.5 to achieve great results.
Autonomous Software Engineering
Automating end-to-end debugging and system-wide refactoring with a record-breaking 80.9% SWE-bench score.
Agentic Research Workflows
Synthesizing vast amounts of technical data into actionable business strategies using the 200k context window.
High-Fidelity UI/UX Vision
Converting complex Figma designs and architectural diagrams into production-ready frontend code with pixel-perfect accuracy.
Multi-Agent Orchestration
Serving as the central brain for teams of sub-agents to manage long-horizon projects across disparate codebases.
Advanced Data Analysis
Automating complex financial modeling and Excel workflows with high precision and reasoning depth.
Literary and Creative Drafting
Producing nuanced prose that adheres to specific writerly tastes and complex human-centric design principles.
Strengths
Limitations
API Quick Start
anthropic/claude-opus-4.5
import Anthropic from '@anthropic-ai/sdk';
const anthropic = new Anthropic({
apiKey: process.env.ANTHROPIC_API_KEY,
});
const msg = await anthropic.messages.create({
model: 'claude-opus-4-5-20251101',
max_tokens: 4096,
effort: 'high',
messages: [{ role: 'user', content: 'Analyze this system architecture for race conditions.' }],
});
console.log(msg.content[0].text);Install the SDK and start making API calls in minutes.
Community Feedback
See what the community thinks about Claude Opus 4.5
“Claude Opus 4.5 feels less like a stateless assistant and more like a persistent teammate. It can trace assumptions across multiple files in a way that feels clearly stronger.”
“Watching your AI agent develop a social media persona that resonates with real people in ways you cannot explain. Infrastructure matters more than prompts.”
“Opus is the best performing model in this aspect. Its discussion is most natural, and it truly follows along with you in discussion.”
“Opus 4.5 hits the most little nuances. It is the only model to successfully include an inline trailer mechanism in the first pass.”
“The 80.9% SWE-bench score is probably real but also kinda misleading. It requires clear environment setup to hit those numbers consistently.”
“SWE-bench Verified: 80.9% (Opus 4.5) vs 71.3% (Claude 3-Opus). This is a massive jump for real-world reliability.”
Related Videos
Watch tutorials, reviews, and discussions about Claude Opus 4.5
“Opus 4.5 has taken down Ahmed's integral. 5 pi^2 over 96 is indeed the right answer.”
“Yeah, it's more lines of code. Gemini 3 tries to compress into far fewer lines of code. Yeah. I mean,”
“maze. Opus 4.5 solved the maze. It only took like freaking like 20 minutes or something. I don't know exactly how long it took there, but it uh it indeed solved the maze.”
“claude opus 4.5 is better than sonnet as well as opus 4.1.”
“Soon, we won't bother to check generated code for the same reasons we don't check compiler output.”
“Clot code is basically stateless. It does not remember anything about this codebase... it's crazy.”
“Anthropic has released Claude Opus 4.5... the most powerful coding model now.”
“it is now $5 per million input tokens and $25 per million output tokens.”
“absolutely decimation of every other result that I've ever tried this with.”
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Pro Tips
Expert tips to help you get the most out of Claude Opus 4.5 and achieve better results.
Toggle Reasoning Effort
Use the effort parameter to select high for complex logic or coding tasks and medium for standard creative writing.
Vision-Native Design
Upload high-resolution screenshots of UI bugs as the model is tuned to identify visual discrepancies that text descriptions miss.
Structured System Prompts
Define clear agentic roles and effort levels in your system prompts to prevent the model from overthinking simpler procedural tasks.
Context Compaction
Summarize history in long-running sessions to keep the 200k context window focused on the most relevant information.
Testimonials
What Our Users Say
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Frequently Asked Questions
Find answers to common questions about Claude Opus 4.5