Fractional CTO

Original data

Research

Original research from a fractional CTO's vantage point.

Bar chart: ChatGPT shares 4 to 6 percent of its cited domains with Claude, Perplexity and Gemini; those three share 14 to 18 percent with each other; one engine repeats 29 to 55 percent week to week

Citation data

AI Engines Don't Agree on Sources

Seven months of sources from ChatGPT, Claude, Gemini and Perplexity on 119 B2B buyer questions.

Sep 29, 2026 · 15 min read
Citations dashboard showing citation rate by engine for ChatGPT, Claude, Gemini and Perplexity, and how many engines cite each question

Citation data

AEO Isn't SEO With a New Name

What 5,000 ChatGPT and Claude citations over 2.5 months show about who AI search recommends.

May 5, 2026 · 12 min read

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