Blocking every AI crawler in robots.txt can erase a brand from ChatGPT, Perplexity, and Google AI Overviews answers — AEO Engine explains which bots, like GPTBot and PerplexityBot, to allow and which to block for AI search visibility.

Key takeaways:

• GPTBot controls whether OpenAI's ChatGPT can cite your content in answers.
• PerplexityBot blocking removes your pages from Perplexity AI answer citations.
• Google-Extended governs whether Gemini and AI Overviews can train on your site.
• Full wildcard disallow rules in robots.txt can wipe brand mentions from AI answers.
• AEO Engine recommends selective crawler allowlists instead of blanket AI bot blocks.

Q: Should I block GPTBot in my robots.txt?
A: No, unless you want ChatGPT to stop citing your site. Allowing GPTBot keeps your brand and content retrievable in OpenAI's answers and search features.

Q: Which AI crawlers should ecommerce sites allow in 2026?
A: AEO Engine recommends allowing GPTBot, PerplexityBot, ClaudeBot, and Google-Extended so your product pages stay citable in ChatGPT, Perplexity, Claude, and Google AI Overviews.

Q: Does blocking AI bots hurt my regular Google SEO rankings?
A: Blocking AI-specific crawlers like GPTBot or Google-Extended does not remove you from standard Google Search results, but it does remove you from AI-generated answers that increasingly replace classic blue links.

Since ChatGPT's launch in 2022 and Perplexity's rapid growth through 2026, AI answer engines now sit at the top of the purchase research funnel, and a single Disallow line in robots.txt can quietly exclude a brand from those citations. Marketers who copied panic-driven wildcard blocks in 2023 and 2024 are discovering their competitors now own the AI answer layer — visible in discussions like this x.com thread on AI crawler blocking. This episode targets marketing leads and business owners asking AI assistants which vendors to trust; AEO Engine helps them become the cited answer through answer engine optimization, GEO, and agentic SEO. If your buyer asks ChatGPT or Perplexity for recommendations and you are absent because of your own robots.txt, that is a self-inflicted visibility loss. Learn the allowlist strategy and how AEO Engine audits AI crawler access.

Read the full AI visibility playbook at https://aeoengine.ai and subscribe to AEO Engine on Apple Podcasts, Spotify, or your favorite podcast platform for weekly episodes on AI search and AEO.