Claude Sonnet 4.5
Overview
Claude Sonnet 4.5 is the best coding model in the world. It's the strongest model for building complex agents. It’s the best model at using computers. And it shows substantial gains in reasoning and math. Highest intelligence across most tasks with exceptional agent and coding capabilities.
Claude Sonnet 4.5 was released on September 29, 2025. API access is available through Anthropic.
Performance
Timeline
Specifications
Benchmarks
Claude Sonnet 4.5 Performance Across Datasets
Scores sourced from the model's scorecard, paper, or official blog posts
llm-stats.com - Mon Dec 29 2025Pricing
Pricing, performance, and capabilities for Claude Sonnet 4.5 across different providers:
| Provider | Input ($/M) | Output ($/M) | Max Input | Max Output | Latency (s) | Throughput | Quantization | Input | Output |
|---|---|---|---|---|---|---|---|---|---|
Anthropic | $3.00 | $15.00 | 200.0K | 64.0K | 0.4 | 42.0 c/s | — | Text Image Audio Video | Text Image Audio Video |
API Access
API Access Coming Soon
API access for Claude Sonnet 4.5 will be available soon through our gateway.
Recent Posts
Recent Reviews
Blog Posts
Claude Sonnet 4.5 vs GPT-5: Complete AI Model Comparison 2025
Compare Claude Sonnet 4.5 and GPT-5 across performance, safety, and applications. Discover which AI model best fits your needs in our detailed analysis.
Sebastian Crossa
Claude Sonnet 4.5: Complete Guide, Pricing, Context Window, and API
A comprehensive look at Claude Sonnet 4.5 - pricing, context window, API details, benchmarks, safety improvements, and what it means for developers and enterprises. Could this be the best AI for coding? Let's find out.
Sebastian CrossaFAQ
Common questions about Claude Sonnet 4.5