Should I block GPTBot and ClaudeBot in robots.txt?

Should I block GPTBot and ClaudeBot in robots.txt?Most Canadian businesses should NOT block GPTBot, ClaudeBot, PerplexityBot, or Google-Extended in robots.txt. Blocking them removes your content from the training and live-citation pools of the corresponding AI engines, which means those engines will not cite your site as a source. Blocking only makes sense for proprietary content, paywalled content, or sites with explicit policies against AI use.AnswerBlocking AI crawlers in robots.txt was a popular tactic in 2023–2024 when site owners feared their content was being scraped to train competing models without compensation. The decision in 2026 is more nuanced because most major AI engines now cite the live web — and a blocked crawler means your site cannot be cited.**The crawlers that matter for citation visibility:**- `GPTBot` — OpenAI's training crawler - `OAI-SearchBot` — OpenAI's live web search crawler (separate from training) - `ClaudeBot` — Anthropic's training crawler - `Claude-Web` — Anthropic's live web crawler - `PerplexityBot` — Perplexity's crawler (used for both training and live citation) - `Google-Extended` — Google's AI training crawler (separate from Googlebot) - `Applebot-Extended` — Apple's AI training crawler - `Bytespider` — ByteDance's crawler (training and search)**The practical decision matrix:****Block AI crawlers if:** your business model depends on selling content access (paywalled news, premium research reports, subscription education); you have explicit licensing agreements or pursue them as a revenue stream; your industry has explicit ethical concerns about AI use of your content; you publish content with confidentiality requirements (legal, medical, internal).**Allow AI crawlers if:** your business model depends on discovery and inbound traffic (most Canadian small and mid-market businesses); your content is openly published anyway and freely indexed by Google; AI citation visibility is a strategic priority; you want your brand to appear in AI-synthesized answers.**For most Canadian small and mid-market businesses, allowing AI crawlers is the correct decision.** The compounding benefit of AI citation visibility over the next 3–5 years substantially exceeds the speculative downside of being part of a training corpus.**Selective blocking.** You can block specific crawlers while allowing others. For example, blocking the training crawler (GPTBot) while allowing the live search crawler (OAI-SearchBot) keeps your site available for live citations while excluding it from model training. This selective stance is increasingly common in 2026.**Audit your current robots.txt.** Many Canadian sites blocked AI crawlers in 2023–2024 and have not revisited the decision. If your current robots.txt still blocks GPTBot or similar, evaluate whether the blocking still serves your business goals.