AI Crawler Permissions: robots.txt for GPTBot, ClaudeBot, PerplexityBot
GPTBot, ClaudeBot, and PerplexityBot are three bots each, not one. A sourced robots.txt reference from OpenAI, Anthropic, and Perplexity’s own docs.
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Claude Limitations in 2026: A Documented, Sourced List
Claude’s own system cards admit real limits in 2026: hallucination rates that vary 8x by methodology, 1M-token context that fails 1-in-4 retrievals, and Claude Code caps changed four times since March.
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SWE-bench Explained: Original vs Lite vs Verified vs Pro
SWE-bench is four benchmarks, not one. OpenAI dropped Verified over contamination in Feb 2026 — here’s what each variant measures and where scores stand.
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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.
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.
How to Check If a Page or Website Is Indexed by Google (2026 Guide)
Find out if Google has indexed your page or site in 2026 using the site: operator, URL Inspection tool, and Search Console’s Pages report — plus fixes.
Google BERT Update Explained: The Moment Search Learned to Read (2019–2026)
What Google’s BERT update was, how it changed search, and the direct line from BERT to MUM, helpful content, and 2026’s AI Overviews.