Claude Opus 4.5
Anthropic's most capable AI model, built for complex coding, autonomous agents, and multi-step reasoning tasks.
What is Claude Opus 4.5?
Claude Opus 4.5 is Anthropic's flagship AI model released in November 2024, designed for the hardest coding and reasoning tasks.
It's the first model to break 80% on the SWE-bench Verified coding benchmark and can run autonomously for 30+ hours on complex multi-step tasks. It has a 200K token context window and supports an "effort" parameter that lets you control how many tokens it uses when responding.
Most builders use it for complex codebases, building AI agents that need to make decisions across multiple systems, and tasks that require deep reasoning without hand-holding. It's particularly strong at computer use tasks with a new zoom feature for inspecting UI elements at full resolution.
Pricing is $5 per million input tokens and $25 per million output tokens. Available through Claude.ai, the API, and major cloud platforms.
Good to Know
First model to score above 80% on SWE-bench Verified coding benchmark
Supports 200K token context window and can run autonomously for 30+ hours
Includes effort parameter to control token usage and response thoroughness
Enhanced computer use with zoom feature for detailed UI inspection
Priced at $5/$25 per million tokens, 67% cheaper than previous Opus models
How Vibe Coders Use Claude Opus 4.5
Debugging a complex multi-system bug that spans your backend, frontend, and database
Building an AI agent that can navigate your app, test features, and file detailed bug reports
Analyzing a 50K-line codebase to understand architecture and suggest refactors
Creating automation workflows that make decisions across multiple tools and APIs
Frequently Asked Questions
Related Terms
AI systems that break complex tasks into steps, make decisions autonomously, and adapt based on results without constant human input.
AI safety company that builds Claude, a large language model focused on being helpful, honest, and harmless with strong reasoning capabilities.
Autonomous software that observes, decides, and acts to complete tasks without constant human input, using LLMs as their decision-making brain.
AI agents that autonomously plan, write, test, and refactor code with minimal human prompting, handling entire workflows instead of single tasks.
Anthropic's command-line AI assistant that lives in your terminal, reads your codebase, and writes code across multiple files.
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