ChatGPT change log

Latest brief:

What changed in ChatGPT, by date: every Paralax brief about it, each linking its source where one exists.

Dated briefs

  1. OpenAI's Crawl Bot Jumped 838% While Its Answer Bot Fell 49%: Don't Block OAI-SearchBot Over It

    If OAI-SearchBot traffic spiked this month, blocking it is the wrong move: that costs ChatGPT search eligibility. Five weeks of logs across five domains show why — ChatGPT-User fetches fell 49% while OAI-SearchBot crawls rose 838%, and 87% of that crawl rise came from one domain, a site event, not an engine change.

    Primary source: developers.openai.com

  2. ChatGPT Citation Support Rate Holds at 5x the Sample

    Machine Relations' live Fidelity cohort has now graded 8,258 ChatGPT citations at 53.4% supported, confirming the September frozen-sample rate of 54.8%. Perplexity, Gemini and Claude still have no live-cohort rate.

  3. ChatGPT Citation Change Log: It Skips 144 of the 500 Most-Cited Domains

    A dated record of what ChatGPT cites and what changes, read from the Machine Relations Index. Entry one: ChatGPT has the weakest overlap with the index head of any of the six engines, reaching 356 of the top 500 where Perplexity reaches 489.

  4. OpenAI's ChatGPT Fetch Bot Turns Robots.txt Into a Citation Access Problem

    OpenAI separates ChatGPT Search, training crawls, and user-triggered fetches into different access rules.

    Primary source: developers.openai.com

  5. ChatGPT's Connector Search Turns AI Search Into a Private-Data Router

    ChatGPT connectors move AI search from public web retrieval into private enterprise source routing.

    Primary source: help.openai.com

  6. ChatGPT Answers, But It Rarely Refers: Inside the 45,000-Household Study Rewriting Search Economics

    A Bocconi clickstream study finds ChatGPT refers out in 5.2% of sessions vs Google's 31.1% — and cuts traditional search 17% in twenty weeks.

  7. ChatGPT Voice Just Became an AI Search Surface

    OpenAI's GPT-Live makes ChatGPT Voice a search surface with web search, memory, and visual answer cards.

    Primary source: openai.com

  8. Cloudflare and OpenAI's AI Search Pilot Turns Freshness Into Crawl Permission

    Cloudflare and OpenAI are testing whether AI search can crawl by freshness signals instead of blind recrawling.

    Primary source: cloudflare.com

  9. ChatGPT UTM tags measure the click not the citation

    OpenAI documents automatic chatgpt.com UTM tagging on ChatGPT referrals, which makes AI clicks visible in analytics while citation exposure stays unmeasured.

    Primary source: help.openai.com

  10. ChatGPT Personal Finance Is a Vertical Search Surface Now

    OpenAI's finance rollout turns ChatGPT into a high-intent vertical answer surface.

    Primary source: help.openai.com

  11. OpenAI Lockdown Mode Turns Agentic Search Security Into A Product Tradeoff

    OpenAI's Lockdown Mode shows agentic search now has a security-versus-freshness tradeoff.

    Primary source: help.openai.com

  12. ChatGPT Memory Turns AI Search Into a Persistent Discovery Layer

    OpenAI's memory upgrade makes AI search more persistent, personalized, and harder to measure.

    Primary source: openai.com

Baseline measurements

Measured citation behavior for this engine, recorded release by release: ChatGPT Citation Change Log: It Skips 144 of the 500 Most-Cited Domains