Claude Opus 4.5
by Anthropic
Claude Opus 4.5 is Anthropic’s frontier reasoning model optimized for complex software engineering, agentic workflows, and long-horizon computer use. It offers strong multimodal capabilities, competitive performance across real-world coding and reasoning benchmarks, and improved robustness to prompt injection. The model is designed to operate efficiently across varied effort levels, enabling developers to trade off speed, depth, and token usage depending on task requirements. Opus 4.5 supports advanced tool use, extended context management, and coordinated multi-agent setups, making it well-suited for autonomous research, debugging, multi-step planning, and spreadsheet/browser manipulation. It delivers substantial gains in structured reasoning, execution reliability, and alignment compared to prior Opus generations, while reducing token overhead and improving performance on long-running tasks.
Specifications
Technical details and pricing.
Benchmarks
10 benchmark scores from Artificial Analysis.
Composite Indices
Intelligence, Coding, Math
Standard Benchmarks
Academic and industry benchmarks
Frequently Asked Questions
What is Claude Opus 4.5 good for?
Use Claude Opus 4.5 for everyday tasks like writing, summarizing, brainstorming, and getting clear explanations.
How much does Claude Opus 4.5 cost?
Pricing is based on usage. Current rates are $5.00/1M tokens for input and $25.00/1M tokens for output.
Can I try Claude Opus 4.5 for free?
Yes. You can start a chat instantly and test the model before deciding on a plan.
Does Claude Opus 4.5 support images or audio?
Claude Opus 4.5 can understand images.
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Benchmarks and pricing are sourced from Artificial Analysis where available. OpenRouter specs are used as a fallback.