# Docs URL Benchmark: Markdown & llms.txt \> HTML

DevFeed: [Docs URL Benchmark: Markdown & llms.txt \> HTML](<https://devfeed.tech/articles/docs-url-benchmark-markdown-llms-txt-html-31063.md>)

Original publisher: [Read original article](<https://www.mintlify.com/blog/llms-txt-agent-benchmark>)

Author: Aadit Shah

Published: 2026-07-17T00:00:00Z

Content type: article

Language: en

Sources: [Mintlify Blog](<https://devfeed.tech/sources/mintlify-blog.md>)

Topics: [Documentation](<https://devfeed.tech/topics/documentation.md>), [Benchmark](<https://devfeed.tech/topics/benchmark.md>), [Artificial Intelligence](<https://devfeed.tech/topics/ai.md>), [Claude](<https://devfeed.tech/topics/claude.md>), [codex](<https://devfeed.tech/topics/codex.md>)

Tags: [ai-agents](<https://devfeed.tech/tags/ai-agents.md>), [benchmark](<https://devfeed.tech/tags/benchmark.md>), [claude](<https://devfeed.tech/tags/claude.md>), [codex](<https://devfeed.tech/tags/codex.md>), [docs](<https://devfeed.tech/tags/docs.md>), [engineering](<https://devfeed.tech/tags/engineering.md>), [html](<https://devfeed.tech/tags/html.md>), [markdown](<https://devfeed.tech/tags/markdown.md>)

## AI overview

Mintlify benchmarked HTML, plain markdown, markdown linking to llms.txt, and markdown with llms.txt inlined across 2,400 runs on 20 documentation sites. The results found that linking to llms.txt eliminated most agent 404s without added cost.

## Source excerpt

We benchmarked four ways to serve documentation to AI agents (HTML, plain markdown, markdown linking to llms.txt, and markdown with llms.txt inlined) across 2,400 runs on 20 Mintlify docs sites, and found that a single link to llms.txt eliminates most agent 404s at no added cost.