Claude 4.5 Opus
Parameters
-
Context Length
200K
Modality
Text
Architecture
Dense
License
Proprietary
Release Date
1 Nov 2025
Knowledge Cutoff
-
Technical Specifications
Attention Structure
Multi-Head Attention
Hidden Dimension Size
-
Number of Layers
-
Attention Heads
-
Key-Value Heads
-
Activation Function
-
Normalization
-
Position Embedding
Absolute Position Embedding
Claude 4.5 Opus
Base Claude 4.5 Opus model without thinking mode for direct, efficient responses. Maintains high-quality performance with minimal latency. Strong web development capabilities (Elo 1478) and well-rounded performance across tasks. Suitable for interactive applications and scenarios where thinking overhead is not required.
About Claude 4.5
Enhanced Claude models with further improvements in reasoning, coding, and agentic capabilities. Features advanced thinking modes with adjustable effort levels (high, medium, standard) for optimal performance-latency tradeoffs. Excels at complex analysis, software development, web development, and long-context understanding. Includes thinking variants that expose reasoning process for improved transparency.
Other Claude 4.5 Models
Evaluation Benchmarks
Rank
#29
| Benchmark | Score | Rank |
|---|---|---|
Web Development WebDev Arena | 1478 | 🥉 3 |
Rankings
Overall Rank
#29
Coding Rank
#18