Leaderboard/OpenRouter

OpenRouter

openrouter.ai/docs
Score: 95 out of 100, grade A95
Grade A
Last checked: May 12, 2026 · Rerun
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Simulation: Fern // bud
Day 0
CategoryAI/ML
Checks passed18/23Warnings3Failed1

OpenRouter scores 95/100 (Grade A), placing it among the most AI-agent-ready documentation sites evaluated. It passes 18 of 23 checks (78%), demonstrating strong support for AI coding agents. 4 items require attention to reach a perfect score.

# Agent Score Fix Report — OpenRouter
URL: https://openrouter.ai/docs/
Score: 95/100 (Grade A)

I need help improving the AI-readiness of the documentation at https://openrouter.ai/docs/.
Agent Score found 1 failing checks and 3 warnings.

## Failing Checks (1)
- [observability] Markdown Content Parity: 2 of 10 pages have substantive content differences between markdown and HTML (avg 15% missing)

## Warnings (3)
- [content-discoverability] Llms Txt Valid: llms.txt contains parseable links but doesn't fully follow the proposed structure: https://openrouter.ai/docs/llms.txt: No blockquote summary found
- [content-discoverability] Llms Txt Size: llms.txt is 54,688 characters (between 50,000 and 100,000; consider splitting)
- [page-size] Page Size Html: 2 of 10 sampled pages convert to 50K–100K chars (max 5255K HTML → 68K markdown (100% boilerplate))

## Fix Instructions

For each issue above, please:
1. Analyze the documentation site at https://openrouter.ai/docs/
2. Implement the specific fix
3. Verify the fix would cause the check to pass

### Common fixes:
- **No llms.txt**: Create /llms.txt following https://llmstxt.org — list all doc pages in markdown format
- **No .md URL support**: Configure your docs platform to serve pages at equivalent .md URLs (e.g. /docs/quickstart.md)
- **No content negotiation**: Return markdown when request includes Accept: text/markdown header
- **Large page size**: Reduce nav boilerplate, inline scripts, and repetitive markup
- **No sitemap**: Generate /sitemap.xml listing all documentation URLs
- **Auth walls**: Ensure docs pages return 200 without requiring login cookies or tokens
- **No Last-Modified header**: Configure your server/CDN to include Last-Modified response headers
- **Tab content hidden**: Ensure tabbed content is rendered in the HTML (not JS-only) so agents can read all variants

## Run afdocs Locally for More Detail

To get deeper visibility into what's failing, run afdocs against your docs:

  npx afdocs check https://openrouter.ai/docs/ --fixes --verbose

- **--fixes**: Adds "Fix:" lines to the output for each warn/fail check with actionable remediation steps
- **-v, --verbose**: Shows per-page details (specific URLs, character counts, error codes) for checks with issues — useful for per-URL visibility into what's failing
CHECK RESULTS

How your docs scored

auth-gate-detectionAll 10 sampled pages are publicly accessibleLearn more
auth-alternative-accessAll docs pages are publicly accessible; no alternative access paths neededLearn more
markdown-content-parity2 of 10 pages have substantive content differences between markdown and HTML (avg 15% missing)Learn more
llms-txt-coveragellms.txt covers 100% of 269 sitemap doc pagesLearn more
cache-header-hygieneAll 11 endpoints have appropriate cache headersLearn more
llms-txt-validllms.txt contains parseable links but doesn't fully follow the proposed structure: https://openrouter.ai/docs/llms.txt: No blockquote summary foundLearn more
llms-txt-sizellms.txt is 54,688 characters (between 50,000 and 100,000; consider splitting)Learn more
llms-txt-existsllms.txt found at https://openrouter.ai/docs/llms.txtLearn more
llms-txt-links-resolveAll 10 same-origin sampled links resolve (270 total links)Learn more
llms-txt-links-markdown10/10 same-origin sampled links point to markdown content (100%)Learn more
llms-txt-directive-htmlllms.txt directive found in HTML of all 10 sampled pages, near the top of contentLearn more
llms-txt-directive-mdllms.txt directive found in markdown of all 10 sampled pages, near the top of contentLearn more
page-size-html2 of 10 sampled pages convert to 50K–100K chars (max 5255K HTML → 68K markdown (100% boilerplate))Learn more
rendering-strategyAll 10 sampled pages contain server-rendered contentLearn more
page-size-markdownAll 10 pages under 50K chars (median 10K, max 28K)Learn more
content-start-positionContent starts within first 10% on all 10 sampled pages (median 0%)Learn more
markdown-url-support10/10 sampled pages support .md URLs (100%)Learn more
content-negotiation10/10 sampled pages support content negotiation (100%)Learn more
tabbed-content-serializationNo tabbed content detected across 10 sampled pagesLearn more
section-header-qualityNo tabbed content found; header quality check not applicableLearn more
markdown-code-fence-validityAll 41 code fences properly closed across 11 pagesLearn more
http-status-codesAll 10 sampled pages return proper error codes for bad URLsLearn more
redirect-behaviorNo redirects detected across 10 sampled pagesLearn more

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