Search Visibility OS
OpenAI WebGPT demonstrates browser-based answering with citations
OpenAI published WebGPT, a GPT-3-based system that searches the web, follows links and cites sources while answering questions.
Perplexity introduces Q2D-Web for large-scale retrieval evaluation in agentic RAG
Perplexity released Q2D-Web, a production-shaped retrieval benchmark built around 190 million web documents and 69,721 agent-reformulated queries across 10 languages.
Anthropic launches web search on the Claude API
Anthropic added web search to its API, allowing Claude-based applications to retrieve current web information and return citations.
Perplexity launches its answer engine
Perplexity states that it launched its first answer engine in December 2022, combining AI-generated answers with web sources and inline citations.
OpenAI launches ChatGPT Search
OpenAI launched ChatGPT Search with timely web answers and links to relevant sources.
Microsoft launches the new AI-powered Bing
Microsoft launched an AI-powered Bing experience combining search, conversational answers and source-linked web information.
Retrieval-Augmented Generation (RAG) is formalized in research
Researchers introduced RAG models that combine pretrained generative models with retrieved non-parametric knowledge.
ChatGPT launches Shopping Research
OpenAI introduced a multi-step shopping research experience that researches products across the internet and builds personalized buyer guides.
AI Citations
Attribution, linking, and source selection in AI-generated answers.
AI Visibility Measurement
Methods and metrics for measuring mentions, citations, share of voice, and discoverability.
Claude Web Search
Anthropic's web-search and citation capabilities.
Generative Engine Optimization (GEO)
Optimization for visibility, citation, or inclusion in generative search and answer engines.
llms.txt is a proposal/convention, not an established web standard with proven universal ranking or citation effects.
Evidence: established · Confidence 95%
Does llms.txt materially affect inclusion, citation frequency, or retrieval in major AI search systems?
Adoption does not establish causal visibility impact.
How stable are citations and recommendations across repeated prompts in each major AI search platform?
Probabilistic outputs complicate visibility measurement.
Which types of third-party corroboration most influence brand/entity recommendations in AI systems?
Industry claims about co-citation and earned media often lack causal evidence.