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Semantic Scholar

active

Allen AI's free academic search engine. 214M+ papers, citation graphs, TLDR summaries, free API. Foundation layer — Consensus builds on it. Not an agent, but essential discovery tool.

Score 35

Where it wins

214M+ papers — largest open academic database

Citation graphs and TLDR summaries

Free API — no cost for integration

Foundation layer: Consensus and other tools build on it

Author and journal filtering

Open access indicators

Where to be skeptical

Not an agent — search and discovery only, no synthesis

No deep research or report generation

No MCP server

Infrastructure, not an end-user research tool

Editorial verdict

Infrastructure layer for academic research, not a ranked research agent. 214M papers, citation graphs, free API. Consensus and other tools build on it. Essential for paper discovery and citation mapping but not a standalone research agent.

Related

Research

Related but not ranked

GPT Researcher

89

Open-source autonomous deep research agent. CMU DeepResearchGym #1 on citation quality, report quality, info coverage. 25.8K stars, 15.9K weekly PyPI downloads. Apache 2.0.

Tongyi DeepResearch

82

First 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)

66

Stanford'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

43

Research-first search engine with inline citations. Fastest deep research (15-30s), 93.9% SimpleQA accuracy, 50+ sources per report. $20/mo Pro.

Public evidence

Raw GitHub source

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