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Stack Overflow (stackoverflow.com): AI Crawler Rules in robots.txt

Which AI bots does Stack Overflow block in robots.txt? Not recorded on . Unknown Source · Methodology

Too few observations yet: we need 2 checks of the main question on 2 different days.

To publish rules like these for your own site, see How to Block GPTBot and Other AI Crawlers in robots.txt. A host or CDN can also block AI crawlers on its own, which robots.txt does not show: our hosting checker names the provider behind any domain, and our hosting price tracker shows what the plans we check cost.

What robots.txt says

0 of 17 bots disallowed on /

robots.txt disallows 0 of 17 monitored bots on path /. 17 not evaluated.

  • Amazonbot · Unknown
  • anthropic-ai · Unknown
  • Applebot-Extended · Unknown
  • Bytespider · Unknown
  • CCBot · Unknown
  • ChatGPT-User · Unknown
  • Claude-SearchBot · Unknown
  • Claude-User · Unknown
  • ClaudeBot · Unknown
  • cohere-ai · Unknown
  • DuckAssistBot · Unknown
  • Google-Extended · Unknown
  • GPTBot · Unknown
  • meta-externalagent · Unknown
  • OAI-SearchBot · Unknown
  • Perplexity-User · Unknown
  • PerplexityBot · Unknown

Homepage and robots.txt responses at our latest check

homepage HTTP 403 · not reachable · robots.txt HTTP 418
Homepage
HTTP 403 · not reachable
Challenge page
Detected (Cloudflare): Cloudflare: cf-mitigated=challenge; Cloudflare: challenge marker in body
robots.txt
HTTP 418

History and how we checked

25 records since Sep 28, 2026

How we got this number

Record history 25 records for 1 question
Last record
Shown in
Switzerland
TimeValueStatus
Oct 18, 2026UnknownUnknown
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