DeepSearch and DeeperSearch crawl both the web and X simultaneously. No competitor offers this.
Grok DeepSearch / DeeperSearch
activeOnly deep research tool with native real-time X/Twitter integration. 4-agent parallel system. Useful for journalists and trend research. Factual precision weaker than Perplexity on non-social topics.

Where it wins
Only deep research tool with native real-time X/Twitter integration
4-agent parallel system for fact-checking and synthesis
DeeperSearch mode with extended search + more reasoning
Journalists use for breaking story orientation (Awesome Agents)
Grok 5 planned with 6T params and native video understanding
Where to be skeptical
No hard benchmark numbers from independent sources — qualitative reviews only
Factual precision inferior to Perplexity on non-social topics (Awesome Agents)
Requires X Premium subscription — tied to social media platform
No MCP support, no API for research mode
Narrow use case — social media + breaking news only
Editorial verdict
#8 in research. Uniquely positioned for social media and breaking news research — only tool with native X/Twitter integration. But no hard benchmark numbers from independent sources. Qualitative reviews only. Niche use case limits general ranking.
Related

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Tongyi DeepResearch
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STORM (Stanford)
66Stanford's LLM-powered knowledge curation system. Generates Wikipedia-style articles with citations in ~3 min. 28K stars, 84.8% citation recall / 85.2% precision (peer-reviewed). MIT license.

Perplexity Deep Research
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Public evidence
Usage evidence from credible use case, though not heavily cited.
Raw GitHub source
GitHub README could not be fetched right now.