Claude Opus 4.5
About this model
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.
Performance Tier
Claude Opus 4.5 is a balanced model from Claude : strong performance at a reasonable price.
Strong cost-performance ratio. Reliable for most professional use cases without premium pricing.
Pricing
This model is included in Elosia plans| Type | per 1M tokens |
|---|---|
| Input (prompt) | $5.00 |
| Output (completion) | $25.00 |
| Cache read | $0.500 |
| Cache write | $6.25 |
Capabilities
Benchmarks
Recommended Use Cases
Strengths
- Top-tier reasoning and knowledge understanding
- Excellent at complex multi-step agentic tasks
- Strong graduate-level science reasoning (GPQA 83.3%)
- Reliable instruction following with high accuracy
Limitations
- Premium pricing — most expensive Claude model after Opus 4.6
- Slower than Sonnet for simple queries
Resources
This model may use your data for training