# AI Search Change Log

> One page per engine. Each lists the Paralax briefs about that engine, newest first, with the date and the change in one line. Each brief links its source where one exists.

- Canonical: https://paralax.ai/engines

## Engines

### [ChatGPT change log](https://paralax.ai/engines/chatgpt)

- Latest brief: 2026-09-29, [OpenAI's Crawl Bot Jumped 838% While Its Answer Bot Fell 49%: Don't Block OAI-SearchBot Over It](https://paralax.ai/blog/openai-answer-time-fetch-index-crawl-divergence-2026)
- Primary source: [developers.openai.com](https://developers.openai.com/api/docs/bots)
- Briefs: 12
- Markdown: https://paralax.ai/engines/chatgpt.md

### [Perplexity change log](https://paralax.ai/engines/perplexity)

- Latest brief: 2026-09-22, [Perplexity Citation Change Log: 490 of the Top 500 Domains, Recorded Six Sources Deep](https://paralax.ai/blog/perplexity-citation-change-log-2026)
- Briefs: 7
- Markdown: https://paralax.ai/engines/perplexity.md

### [Gemini change log](https://paralax.ai/engines/gemini)

- Latest brief: 2026-09-28, [Gemini Cited No Source in 51.6% of Its Returned Answer Runs](https://paralax.ai/blog/ai-answer-runs-that-cite-nothing-per-engine-2026)
- Primary source: [ai.google.dev](https://ai.google.dev/gemini-api/docs/google-search)
- Briefs: 6
- Markdown: https://paralax.ai/engines/gemini.md

### [Google AI Mode change log](https://paralax.ai/engines/google-ai-mode)

- Latest brief: 2026-09-24, [Google AI Mode and AI Overviews Share at Least 363 of the Top 500 Sources — and Why We Withdrew the Gap Number](https://paralax.ai/blog/google-ai-mode-ai-overviews-source-divergence-2026)
- Latest official change (Google Search): 2026-09-24, Announcing web multimodal Search performance reporting in Search Console ([developers.google.com](https://developers.google.com/search/blog/2026/09/web-multimodal-in-sc))
- Briefs: 13
- Markdown: https://paralax.ai/engines/google-ai-mode.md

### [Google AI Overviews change log](https://paralax.ai/engines/google-ai-overviews)

- Latest brief: 2026-09-24, [Google AI Mode and AI Overviews Share at Least 363 of the Top 500 Sources — and Why We Withdrew the Gap Number](https://paralax.ai/blog/google-ai-mode-ai-overviews-source-divergence-2026)
- Latest official change (Google Search): 2026-09-24, Announcing web multimodal Search performance reporting in Search Console ([developers.google.com](https://developers.google.com/search/blog/2026/09/web-multimodal-in-sc))
- Briefs: 21
- Markdown: https://paralax.ai/engines/google-ai-overviews.md

### [Claude change log](https://paralax.ai/engines/claude)

- Latest brief: 2026-09-23, [Claude Citation Change Log: 463 of the Top 500 Domains, a Panel the Six-Source Cap Barely Touched](https://paralax.ai/blog/claude-citation-change-log-2026)
- Briefs: 7
- Markdown: https://paralax.ai/engines/claude.md

### [Microsoft Copilot and Bing change log](https://paralax.ai/engines/copilot)

- Latest brief: 2026-06-18, [Bing Just Made Citation Share a Reported Metric — AI Visibility Gets Its First Native Yardstick](https://paralax.ai/blog/bing-webmaster-citation-share-ai-visibility-metric-2026)
- Primary source: [blogs.bing.com](https://blogs.bing.com/webmaster/February-2026/Introducing-AI-Performance-in-Bing-Webmaster-Tools-Public-Preview)
- Latest official change: 2026-02-11, Introducing AI Performance in Bing Webmaster Tools Public Preview ([blogs.bing.com](https://blogs.bing.com/webmaster/2026/2/Introducing-AI-Performance-in-Bing-Webmaster-Tools-Public-Preview/))
- Briefs: 2
- Markdown: https://paralax.ai/engines/copilot.md

### [AI crawlers and robots change log](https://paralax.ai/engines/crawlers)

- Latest brief: 2026-09-29, [OpenAI's Crawl Bot Jumped 838% While Its Answer Bot Fell 49%: Don't Block OAI-SearchBot Over It](https://paralax.ai/blog/openai-answer-time-fetch-index-crawl-divergence-2026)
- Primary source: [developers.openai.com](https://developers.openai.com/api/docs/bots)
- Briefs: 7
- Markdown: https://paralax.ai/engines/crawlers.md