Bing Deep Search

Bing Deep Search is an agentic search feature within Microsoft Bing that uses GPT-4 to handle complex queries through deep web exploration. Rather than returning instant results, it takes up to 30 seconds to generate a comprehensive, tailored answer, searching up to ten times more pages than a standard search. Launched officially in March 2024 for all users, Deep Search is part of Microsoft's shift of Bing from a traditional search engine to a reasoning partner, with capabilities including query expansion, disambiguation, and multi-source synthesis. Bing reached 1 billion monthly active users in April 2026, giving Deep Search massive distribution. Deep Search operates within the broader Microsoft ecosystem. Copilot integration lets Deep Search results feed into Microsoft 365 workflows, and Microsoft Edge provides native access through the browser. Integration with Microsoft 365 Copilot ($30/user/month) enables Deep Search against workspace data alongside web data, while Copilot Pro ($20/month) provides expanded usage and faster processing. The feature relies on Microsoft's OpenAI partnership for GPT-4 access, combined with Bing's mature search index infrastructure. No MCP server is published for Deep Search. Pricing is free at the base level: visit Bing.com, enter a complex query, and click the Deep Search button. No payment and no account are required for basic use. Copilot Pro ($20/month) adds expanded usage and faster processing, and Microsoft 365 Copilot ($30/user/month for enterprise) integrates Deep Search with workspace data. The free tier provides a genuine evaluation experience without commitment. Deep Search is a feature within Bing, not a standalone research product. For dedicated agentic research with project management and citation export, ChatGPT Deep Research ($20/mo) and Gemini Deep Research ($19.99/mo) offer purpose-built research workflows. Perplexity AI ($17/mo) provides a consumer research interface with structured citations. Tavily ($0.008/credit, 2M+ developers) and Exa AI ($7/1K requests) serve developers building AI search into applications. Output quality depends on Bing index coverage, degrading for niche or paywalled research domains. As of Q3 2026, Bing Deep Search remains fully available to all users on desktop and mobile through Bing.com, via the Deep Search button on search results pages. Bing reached 1 billion monthly active users in April 2026. The feature uses GPT-4 for query expansion and reasoning. Microsoft operates Bing under enterprise-grade security, including SOC 2 Type II, ISO 27001, GDPR, and HIPAA compliance at the platform level. Bing Search APIs were retired in August 2025, with Microsoft directing developers to Grounding with Bing Search as part of Azure AI Agents for programmatic access.