# Robots.txt and AI crawlers in 2026 — complete guide
> AI crawlers now account for nearly 50% of bot traffic. Learn how to properly configure robots.txt for GPTBot, ClaudeBot and other AI bots.
**Author:** Brand360
**Published:** 2026-04-14
**Tags:** robots.txt, AI crawlery, SEO, GPTBot, ClaudeBot
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# Robots.txt and AI Crawlers in 2026

AI crawlers in Q1 2026 exceeded **49.9% of all AI bot traffic**. Your robots.txt determines whether AI models see your site — and how they use it.



![OpenAI robots.txt — real configuration example](https://obyyebhcubgafdzuzpih.supabase.co/storage/v1/object/public/blog/articles/robots-txt/openai-robots-txt.png)

## Why robots.txt is crucial for AI visibility

Robots.txt is a simple text file in your website's root directory that tells bots what they can and cannot crawl. In the era of AI search, its importance has dramatically increased.

**Key change in 2026:** GPTBot and ClaudeBot started **consuming sitemap.xml** — for the first time ever. This means your sitemap directly affects what AI models index.

## Major AI crawlers you need to know

### Anthropic (3 crawlers)
| Crawler | Purpose | Recommendation |
|---------|---------|----------------|
| **ClaudeBot** | AI model training | Consider blocking |
| **Claude-User** | Real-time fetch on demand | Allow |
| **Claude-SearchBot** | Search indexing | Allow |

### OpenAI (3 crawlers)
| Crawler | Purpose | Recommendation |
|---------|---------|----------------|
| **GPTBot** | Training data | Consider blocking |
| **ChatGPT-User** | Real-time fetch | Allow |
| **OAI-SearchBot** | Search indexing | Allow |

### Google
| Crawler | Purpose | Recommendation |
|---------|---------|----------------|
| **Googlebot** | Traditional indexing | Allow |
| **Google-Extended** | AI training | Consider blocking |

### Others
- **PerplexityBot** — Perplexity AI search
- **Applebot** — grew to 5.8% of AI crawler traffic

## Practical robots.txt example



## Numbers you should know

- Only **5.5% of domains** block GPTBot and **4.7%** block ClaudeBot
- ClaudeBot crawls **19x more pages** per referral than GPTBot
- Out of top 4,047 domains, **13.8%** block GPTBot, **11.5%** block ClaudeBot
- Blanket blocking **doesn't work** — you need granular decisions

## 4 steps to proper configuration

1. **Audit** — check your current robots.txt
2. **Remove deprecated strings** — replace Claude-Web and Anthropic-AI with new ones
3. **Categorize bots** — training (block?) vs search (allow?) vs user-fetch (allow)
4. **Minimum 7 user-agents** — ClaudeBot, Claude-User, Claude-SearchBot, GPTBot, OAI-SearchBot, ChatGPT-User, PerplexityBot

## What is llms.txt and do you need it?

llms.txt is a new format that describes your website for AI models. Adoption is currently only **10%** and has no confirmed impact on citations in AI responses.

**Recommendation:** Implement as a "nice to have", but priority remains a properly configured robots.txt and quality sitemap.

## Conclusion

In 2026, a basic robots.txt is no longer enough. You need to actively manage which AI crawlers have access to your content and for what purpose. Allow search and user-fetch bots for visibility in AI responses, consider blocking training bots if you don't want your data used for model training.

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![OpenAI robots.txt — simple configuration]()

![Anthropic robots.txt — minimalist approach]()

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## Sources and useful links

- [Anthropic Claude Bots — Search Engine Journal](https://www.searchenginejournal.com/anthropics-claude-bots-make-robots-txt-decisions-more-granular/568253/)
- [Monthly AI Crawler Report — WebSearchAPI](https://websearchapi.ai/blog/monthly-ai-crawler-report)
- [Robots.txt Strategy 2026 — Witscode](https://witscode.com/blogs/robots-txt-strategy-2026-managing-ai-crawlers/)
- [Google Search Central — Robots.txt](https://developers.google.com/search/docs/crawling-indexing/robots/intro)
- [OpenAI robots.txt](https://openai.com/robots.txt)
- [Anthropic robots.txt](https://anthropic.com/robots.txt)