llms.txt Explained: Spec, Adoption Data, and Whether It Works
llms.txt adoption hit ~10% of sites, yet 97% of files got zero AI requests in May 2026. What the spec says, what the logs show, and the one real use case.
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ChatGPT Limitations in 2026: A Documented, Sourced List
Every documented ChatGPT limitation in 2026 with version, source, and date: hallucination splits, usable context, memory recall, coding regressions.
GPQA Explained: What It Measures and Why It’s Saturating
GPQA Diamond went from 38.8% to ~94% in under three years. What the benchmark measures, where scores stand in July 2026, and why the last 6% may be flawed questions.
How AI Assistants Decide Which Brands to Recommend
How ChatGPT, Gemini, and Perplexity assemble brand recommendations: retrieval pipelines, citation data from 230K prompts, and what the evidence says moves visibility.
The Limitations Ledger: Documented Failure Modes of Frontier AI Tools
A running, sourced ledger of documented failure modes in frontier AI tools: hallucination rates, context rot, agent reliability, and insecure code.