Claude Opus 5.5
Is Here.
Anthropic’s new flagship: Fable-level intelligence at 40% lower cost. State-of-the-art agentic coding, clearer writing, and a 1M token context window.
What Is Claude Opus?
Claude Opus 5.5 is Anthropic's flagship Opus model. It matches the performance of Anthropic's top-tier Claude Fable 5.1 on most work while costing far less, and leads on agentic coding, long documents, and nuanced, clearly written answers.
With a massive 1 million token context window, Opus can read multiple books, entire codebases, or lengthy legal contracts in a single prompt—delivering safer, smarter, and more human-aligned responses.
Claude Opus Features
Built for performance, safety, and scale.
Long Context Understanding
Process up to 1 million tokens. Analyze entire codebases, summarize books, and maintain context over very long conversations.
Advanced Reasoning
Opus excels at multi-step tasks, logic puzzles, coding challenges, and strategic analysis that stump other models.
Human-Aligned Responses
Designed with Constitutional AI to be helpful, honest, and harmless—reducing bias and hallucinations.
How Claude Opus Is Used
Writing & Summarization
Create high-quality content and summarize long documents with nuance.
Coding Assistance
Generate complex code, debug errors, and architect software solutions.
Research & Analysis
Synthesize information from multiple sources and perform deep analysis.
Education & Learning
Explain complex topics simply and act as a personalized tutor.
Business Productivity
Draft emails, analyze reports, and automate strategic workflows.
Claude Opus vs Other AI Models
vs GPT-6 Astra
Compare coding & price
vs Gemini 4 Argon
Compare context & multimodal
Opus 5.5 vs Opus 5
What's new & should you upgrade
Opus stands out for its high-fidelity writing and coding capabilities, often preferred for creative and technical tasks requiring nuance.
How to Get Started With Claude Opus
Create an Account
Sign up at Anthropic's website to access Claude.ai.
Upgrade to Pro
Claude Opus is available via the Claude Pro subscription.
Start Chatting
Select 'Opus' from the model dropdown and begin.