MistralAI-Index
Mistral AI's search / answer indexing crawler.
Quick answer
MistralAI-Index is the crawler Mistral AI uses to build its own search index. Content it gathers powers Mistral's search feature, used by its Vibe assistant, and Mistral states plainly that this specific crawl is never used to train its generative AI models.
What it does
MistralAI-Index crawls publicly available web pages to build Mistral AI's search index, the data that lets its Vibe assistant answer questions with current information pulled from the web. Mistral is explicit that content crawled by MistralAI-Index is not used for generative AI training of any kind, drawing a firm line between this search-indexing crawler and however Mistral may separately train its underlying language models. MistralAI-Index respects robots.txt, so a site can control whether it participates in Mistral's search index independently of any other crawler. Mistral publishes a dedicated IP range file for this bot, so a site owner can verify that traffic claiming to be MistralAI-Index is genuine before deciding how to treat it.
Facts
Operator
Mistral AI
Robots token
MistralAI-Index
User agent string(s)
- Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; MistralAI-Index/1.0; +https://docs.mistral.ai/robots)
Purpose
Search / answer indexing
Respects robots.txt
Yes
IP ranges
https://mistral.ai/mistralai-index-ips.json
From Mistral AI's documentation, checked Oct 2026.
Should you block it?
Disallowing MistralAI-Index keeps a site out of Mistral's search index, which means it would not appear as a source when Mistral's Vibe assistant answers a search-style question that could have cited it. A brand hoping to be mentioned when someone asks an AI assistant about its category would generally want to stay included here, similar to the reasoning for allowing search-indexing crawlers from other AI companies. Mistral's clear statement that this crawl is never used for generative AI training removes the usual training-data concern from the decision, so a site worried specifically about model training rather than search visibility has less reason to block this particular bot. The main case for blocking it is simply not wanting to appear in Mistral's search results at all, for example if a site has no interest in that platform's audience.
How to block it
Add this to robots.txt to block MistralAI-Index: User-agent: MistralAI-Index Disallow: / Mistral says content crawled by this bot is not used for generative AI training of any kind, so this rule is specifically about search index inclusion.
Frequently asked questions
Does MistralAI-Index train Mistral's AI models?
No. Mistral says content crawled by MistralAI-Index is not used for generative AI training of any kind.
What does MistralAI-Index power?
It builds Mistral's search index, which its Vibe assistant uses to answer questions with current web information.
Can I verify MistralAI-Index traffic?
Yes. Mistral publishes a dedicated IP range file for this crawler at mistral.ai/mistralai-index-ips.json.
Related
- AI crawler directory — every AI crawler's robots.txt token, purpose and facts in one place.
- Free AI crawler checker — check which AI crawlers a domain's robots.txt actually allows or blocks.
- Glossary — definitions of the AI-visibility terms that come up alongside crawler behavior.
Sources
- MistralAI-Index indexes content for Mistral search and content it crawls is not used for generative AI training of any kind. Source: https://docs.mistral.ai/en/robots (checked Oct 2026)
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