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. It comes with a new parameter to control token efficiency, which can be accessed using the OpenRouter Verbosity parameter with low, medium, or high.
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.
- Provider
- Anthropic
- Context Length
- 200,000 tokens
- Input Types
- file, image, text
- Output Types
- text
- Category
- Claude
- Added
- 11/24/2025
Benchmark Performance
How Claude Opus 4.5 compares to its closest rivals across industry benchmarks
Metric: Money Balance ($)
Metric: % Resolved
Metric: Intelligence Index
| Specification | Claude Opus 4 Previous | Claude Opus 4.5 Current | Change |
|---|---|---|---|
| Context Window | 200K | 200K | |
| Reasoning Support | |||
| Input Types | image, text, file | file, image, text | |
| Output Types | text | text | |
| Input Price (per 1M) | $15.00 | $5.00 | |
| Output Price (per 1M) | $75.00 | $25.00 |
Frequently Asked Questions
Common questions about Claude Opus 4.5