Claude Sonnet 4.5 Thinking
Parameters
-
Context Length
200K
Modality
Text
Architecture
Dense
License
Proprietary
Release Date
29 Sept 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 Sonnet 4.5 Thinking
Balanced Claude 4.5 model with thinking capabilities for transparent reasoning. Excellent coding performance (80.36 LiveBench Coding), strong reasoning (77.59), and mathematics (79.31). Features visible thought process for explainable AI. Good web development results (Elo 1393). Ideal for technical tasks requiring both capability and transparency.
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
#11
| Benchmark | Score | Rank |
|---|---|---|
Coding LiveBench Coding | 0.80 | ⭐ 4 |
Agentic Coding LiveBench Agentic | 0.64 | 8 |
Reasoning LiveBench Reasoning | 0.78 | 12 |
Web Development WebDev Arena | 1393 | 12 |
Mathematics LiveBench Mathematics | 0.70 | 24 |
Rankings
Overall Rank
#11
Coding Rank
#16