Research-first search engine with inline citations. Fastest deep research (15-30s), 93.9% SimpleQA accuracy, 50+ sources per report. $20/mo Pro.
Where it wins
Fastest deep research (15-30s vs 2-15 min for competitors) — FreeAcademy 2026
93.9% SimpleQA accuracy — Helicone independent test
50+ sources per report (150% more than ChatGPT)
Highest citation reliability across independent comparisons
Reddit r/PhD and r/GradSchool endorsement as go-to research tool
$20/mo Pro with 20 Deep Research queries/day
Pages feature creates live-updating research papers
Where to be skeptical
No MCP support yet — enterprise integration gap vs OpenAI
HLE 21.1% — below OpenAI's 26.6% on expert-level reasoning
Closed source, no self-hosting option
Proprietary — no API for deep research mode (Sonar API is separate)
Editorial verdict
#1 in research. Speed king (15-30s vs minutes for competitors), highest citation reliability in independent tests, 93.9% SimpleQA accuracy (Helicone). Reddit academic communities endorse as go-to. Best value at $20/mo.
Related
GPT Researcher
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Tongyi DeepResearch
82First fully open-source deep research agent matching closed-source leaders on benchmarks. HLE 32.9 (exceeds OpenAI's 26.6), 30.5B params / 3.3B active (MoE), runs locally. 18.5K stars. Apache 2.0.
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.
OpenAI Deep Research
42Agentic research mode powered by o3/o4-mini. 26.6% HLE (highest of any system), 72.57% GAIA, MCP support (Feb 2026). Slower (3-15 min) but deepest reasoning.
Public evidence
10-60x speed advantage over Google (2-5 min) and ChatGPT (3-15 min). Speed is the most cited reason users choose Perplexity.
Concrete benchmark number from OpenAI's own eval, independently reported. Highest practical accuracy.
Highest single-thread engagement for any deep research tool launch on HN.
Organic user switching signal: 'ChatGPT tends to misunderstand or hallucinate about newer material' — PhD student explaining switch to Perplexity.
150% increase in citation volume over ChatGPT. Volume is a proxy for thoroughness.
Raw GitHub source
GitHub README could not be fetched right now.