
OpenAI Web Search
Answer-grounding / GEO: ask a question and get an OpenAI-model answer produced after a live web search, returned with the underlying search results and URL citations. The model and web_search tool are server-pinned; billed pay-as-you-go at exact cost (search count + model tokens, no markup).
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Anthropic Web Search
Anthropic Web Search
Answer-grounding / GEO: ask a question and get a Claude-written answer produced after a live web search, returned with the underlying search results and inline citations. The model and web_search tool are server-pinned; billed pay-as-you-go at exact cost (search count + model tokens, no markup).

Exa
Exa
Neural semantic search over the open web: run natural-language searches, extract full page contents, get direct cited answers, and launch asynchronous research Agent runs through the AIsa API gateway.
Tavily Search
Tavily Search
Search the web, extract page content, crawl sites, and map URLs with Tavily through the AIsa API gateway.