About Claude API
The Claude API provides programmatic access to Anthropic's Claude models for building AI-powered applications. Claude 3.5 Sonnet leads on coding, reasoning and nuanced analysis benchmarks while maintaining Anthropic's focus on safety and helpfulness.
The API supports 200K token context windows, tool use (function calling), structured JSON outputs, vision (image analysis), streaming responses and system prompts. The Messages API provides a clean, modern interface for building conversational applications.
Claude excels at tasks requiring careful reasoning, long document analysis, code generation, content creation and nuanced instruction following. The model is known for producing fewer hallucinations and more balanced responses than competitors.
Pricing is per-token: Claude 3.5 Sonnet at $3 per million input tokens and $15 per million output tokens. Claude 3 Haiku at $0.25/$1.25 per million tokens for cost-sensitive applications.
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