Claude
Free tierAnthropic's safety-focused AI assistant — exceptional at long documents and nuanced reasoning.
Free tier available·All audiences·Powered by Anthropic·API available
Key strengths
200K context windowcodinglong document analysisinstruction following
Free tier + paid plans · from $20 USD/mo
San Francisco, US
Founded 2021
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API Overview
- Endpoint:
POST https://api.anthropic.com/v1/messages - Auth:
x-api-keyheader - Models: claude-opus-4-5, claude-sonnet-4-5, claude-haiku-3-5
- Features: streaming, tool use (function calling), vision, PDF reading
Context caching
Prompt caching reduces cost by up to 90% for repeated prefixes. Pass cache_control: { type: "ephemeral" } on the content block to cache.