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 hits the most little nuances”
“It was the only model to successfully include an inline trailer mechanism in the first pass”
“An agent-driven code evaluation confirms this subjective feeling, scoring Opus at 7/10 for feature completeness”
“The reasoning is far more logical than previous versions when handling edge cases”
“It maintains codebase consistency over 30 minute sessions”
“The price is now three times cheaper. It is only going to be $5 for a million input tokens”
“Input is $5 and output is $25 for a million tokens”
“Opus 4.5 scored higher than any human candidate has ever scored on Anthropic's own take-home exam”
“This is the first model to break the 80 percent barrier on SWE-bench”
“It handles autonomous 30-minute coding sessions without human intervention”
“Think of Claude Opus 4.5 as a persuasion layer and an absolute agentic monster”
“It is an absolute agentic and harness coding monster”
“Engineers end up preferring working with Claude Opus 4.5 because they get those tight feedback loops”
“The reasoning effort parameter is the standout feature for developers”
“It feels more like a collaborator than a tool in long-form discussions”
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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