Claude Sonnet 4.5
Anthropic
anthropic/claude-sonnet-4.5
Reasoning model, 200K context
Context Window
200K
200,000 tokens
Max Output
16K
16,000 tokens
About this model
Claude Sonnet 4.5 via Bedrock, strong balanced performance
This model supports up to 200K tokens of context. It includes native vision understanding for analyzing images and documents. It excels at complex reasoning, mathematical problems, and multi-step tasks. It provides strong code generation and debugging capabilities.
Access it through Chuizi.AI with a single ck- API key β no separate Anthropic account needed.
Highlights
200K context window
16K max output
Advanced reasoning
Native vision support
Strong code generation
Best For
Complex coding tasksAlgorithm designCode reviewTechnical architecture
2025-09-29
Capabilities
ChatVisionReasoningCodepdftoolscache
Aliases
claude-sonnet-4.5Pricing (per 1M tokens)
| Pricing (per 1M tokens) | / 1M tokens |
|---|---|
| Input / 1M | $3.15 |
| Output / 1M | $15.75 |
| Cache Read | $0.32 |
| Cache Write | $3.94 |
Final prices shown
Quick Start
main.py
import anthropic client = anthropic.Anthropic( base_url="https://api.chuizi.ai/anthropic", api_key="ck-your-key-here", ) message = client.messages.create( model="claude-sonnet-4-5-20250929", max_tokens=1024, messages=[{"role": "user", "content": "Hello!"}] ) print(message.content[0].text)