Claude Sonnet 4.5 excels at coding, agentic agents, reasoning, and long-context tasks, balancing strong intelligence, speed, and cost-efficiency for production deployments and complex problem-solving.
Context tokens
200,000
Output tokens
64,000
Training cutoff
May 1, 2025
Released
Sep 29, 2025
Supported languages
Supported input media
Seclai Content Tools
Inspect source documents connected to your account. Includes tools for loading full content, reading character ranges, searching within documents, viewing stats, and listing available content sources. When a source_connection_content_version_id is provided in agent run metadata it is used as the default. Otherwise the model can discover content via list_content_sources.
Seclai Knowledge Base
Search your knowledge bases using semantic similarity. Includes search_knowledge_base and list_knowledge_bases. When a knowledge_base_id is provided in the prompt or agent run metadata it is used as the default. Otherwise the model can discover available knowledge bases at runtime.
Web Fetch
The web fetch tool allows Claude to retrieve full content from specified web pages and PDF documents.
Web Search
The web search tool gives Claude direct access to real-time web content, allowing it to answer questions with up-to-date information beyond its knowledge cutoff. Claude automatically cites sources from search results as part of its answer.
| Type | Credits | Units |
|---|---|---|
| Cache write (1h) | 79.80 | Credits per 1k tokens |
| Cache write (5m) | 49.88 | Credits per 1k tokens |
| Cache hit | 3.99 | Credits per 1k tokens |
Support for longer context windows.
| Option | Description | Input credits (per 1k tokens) | Output credits (per 1k tokens) |
|---|---|---|---|
| 200K or More Context | Context windows of 200,000 tokens or more. | 79.80 | 299.25 |
| Less than 200K Context | Context windows less than 200,000 tokens. | 39.90 | 199.50 |
